| Message ID | 18315277.jcVt0SJ67s@vostro.rjw.lan |
|---|---|
| State | Not Applicable |
| Headers | show |
On Wed, Jan 29, 2014 at 01:00:57AM +0100, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > Use the observation that the ACPI scan handler of the device object > in acpi_hotplug_notify_cb() can be obtained from that device object's > handler pointer and do not pass it as data to > acpi_install_hotplug_notify_handler() in acpi_scan_init_hotplug(). > > That allows the second argument of acpi_install_hotplug_notify_handler() > to be dropped, so do it and update its callers accordingly. > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > --- > drivers/acpi/scan.c | 31 ++++++++++++++++++------------- > drivers/pci/hotplug/acpiphp_glue.c | 2 +- > include/acpi/acpi_bus.h | 2 +- > 3 files changed, 20 insertions(+), 15 deletions(-) > > Index: linux-pm/drivers/acpi/scan.c > =================================================================== > --- linux-pm.orig/drivers/acpi/scan.c > +++ linux-pm/drivers/acpi/scan.c > @@ -487,7 +487,6 @@ static void acpi_device_hotplug(void *da > > static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) > { > - struct acpi_scan_handler *handler = data; > u32 ost_code = ACPI_OST_SC_SUCCESS; > struct acpi_device *adev; > acpi_status status; > @@ -503,13 +502,6 @@ static void acpi_hotplug_notify_cb(acpi_ > > case ACPI_NOTIFY_EJECT_REQUEST: > acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); > - if (handler && !handler->hotplug.enabled) { > - acpi_handle_err(handle, "Eject disabled\n"); > - ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; > - goto out; > - } > - acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, > - ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); > break; > > case ACPI_NOTIFY_DEVICE_WAKE: > @@ -535,11 +527,24 @@ static void acpi_hotplug_notify_cb(acpi_ > goto out; > } > > + mutex_lock(&acpi_scan_lock); This is weird. I'm testing against your test-next branch which has this patch included. If I remove locking here, TBT hotplug works fine. Otherwise I can see the first hotplug/unplug works but after that I cannot get any events anymore. > ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; > - if (acpi_bus_get_device(handle, &adev)) > + if (acpi_bus_get_device(handle, &adev)) { > + mutex_unlock(&acpi_scan_lock); > goto out; > - > + } > + if (type == ACPI_NOTIFY_EJECT_REQUEST) { > + if (adev->handler && !adev->handler->hotplug.enabled) { > + acpi_handle_err(handle, "Eject disabled\n"); > + ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; > + mutex_unlock(&acpi_scan_lock); > + goto out; > + } > + acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, > + ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); > + } > get_device(&adev->dev); > + mutex_unlock(&acpi_scan_lock); > status = acpi_hotplug_execute(acpi_device_hotplug, adev, type); > if (ACPI_SUCCESS(status)) > return; -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, Jan 31, 2014 at 04:42:21PM +0100, Rafael J. Wysocki wrote: > On Friday, January 31, 2014 05:28:36 PM Mika Westerberg wrote: > > On Wed, Jan 29, 2014 at 01:00:57AM +0100, Rafael J. Wysocki wrote: > > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > > > > Use the observation that the ACPI scan handler of the device object > > > in acpi_hotplug_notify_cb() can be obtained from that device object's > > > handler pointer and do not pass it as data to > > > acpi_install_hotplug_notify_handler() in acpi_scan_init_hotplug(). > > > > > > That allows the second argument of acpi_install_hotplug_notify_handler() > > > to be dropped, so do it and update its callers accordingly. > > > > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > --- > > > drivers/acpi/scan.c | 31 ++++++++++++++++++------------- > > > drivers/pci/hotplug/acpiphp_glue.c | 2 +- > > > include/acpi/acpi_bus.h | 2 +- > > > 3 files changed, 20 insertions(+), 15 deletions(-) > > > > > > Index: linux-pm/drivers/acpi/scan.c > > > =================================================================== > > > --- linux-pm.orig/drivers/acpi/scan.c > > > +++ linux-pm/drivers/acpi/scan.c > > > @@ -487,7 +487,6 @@ static void acpi_device_hotplug(void *da > > > > > > static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) > > > { > > > - struct acpi_scan_handler *handler = data; > > > u32 ost_code = ACPI_OST_SC_SUCCESS; > > > struct acpi_device *adev; > > > acpi_status status; > > > @@ -503,13 +502,6 @@ static void acpi_hotplug_notify_cb(acpi_ > > > > > > case ACPI_NOTIFY_EJECT_REQUEST: > > > acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); > > > - if (handler && !handler->hotplug.enabled) { > > > - acpi_handle_err(handle, "Eject disabled\n"); > > > - ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; > > > - goto out; > > > - } > > > - acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, > > > - ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); > > > break; > > > > > > case ACPI_NOTIFY_DEVICE_WAKE: > > > @@ -535,11 +527,24 @@ static void acpi_hotplug_notify_cb(acpi_ > > > goto out; > > > } > > > > > > + mutex_lock(&acpi_scan_lock); > > > > This is weird. I'm testing against your test-next branch which has this > > patch included. If I remove locking here, TBT hotplug works fine. Otherwise > > I can see the first hotplug/unplug works but after that I cannot get any > > events anymore. > > Weird indeed. I don't seem to be able to reproduce that on my Aspire S5. > > What system are you testing on? This is Intel NUC. Let me see if I can reproduce this on S5 with longer chain of devices. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Friday, January 31, 2014 05:28:36 PM Mika Westerberg wrote: > On Wed, Jan 29, 2014 at 01:00:57AM +0100, Rafael J. Wysocki wrote: > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > > Use the observation that the ACPI scan handler of the device object > > in acpi_hotplug_notify_cb() can be obtained from that device object's > > handler pointer and do not pass it as data to > > acpi_install_hotplug_notify_handler() in acpi_scan_init_hotplug(). > > > > That allows the second argument of acpi_install_hotplug_notify_handler() > > to be dropped, so do it and update its callers accordingly. > > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > --- > > drivers/acpi/scan.c | 31 ++++++++++++++++++------------- > > drivers/pci/hotplug/acpiphp_glue.c | 2 +- > > include/acpi/acpi_bus.h | 2 +- > > 3 files changed, 20 insertions(+), 15 deletions(-) > > > > Index: linux-pm/drivers/acpi/scan.c > > =================================================================== > > --- linux-pm.orig/drivers/acpi/scan.c > > +++ linux-pm/drivers/acpi/scan.c > > @@ -487,7 +487,6 @@ static void acpi_device_hotplug(void *da > > > > static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) > > { > > - struct acpi_scan_handler *handler = data; > > u32 ost_code = ACPI_OST_SC_SUCCESS; > > struct acpi_device *adev; > > acpi_status status; > > @@ -503,13 +502,6 @@ static void acpi_hotplug_notify_cb(acpi_ > > > > case ACPI_NOTIFY_EJECT_REQUEST: > > acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); > > - if (handler && !handler->hotplug.enabled) { > > - acpi_handle_err(handle, "Eject disabled\n"); > > - ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; > > - goto out; > > - } > > - acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, > > - ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); > > break; > > > > case ACPI_NOTIFY_DEVICE_WAKE: > > @@ -535,11 +527,24 @@ static void acpi_hotplug_notify_cb(acpi_ > > goto out; > > } > > > > + mutex_lock(&acpi_scan_lock); > > This is weird. I'm testing against your test-next branch which has this > patch included. If I remove locking here, TBT hotplug works fine. Otherwise > I can see the first hotplug/unplug works but after that I cannot get any > events anymore. Weird indeed. I don't seem to be able to reproduce that on my Aspire S5. What system are you testing on?
On Fri, Jan 31, 2014 at 05:40:11PM +0200, Mika Westerberg wrote: > On Fri, Jan 31, 2014 at 04:42:21PM +0100, Rafael J. Wysocki wrote: > > On Friday, January 31, 2014 05:28:36 PM Mika Westerberg wrote: > > > On Wed, Jan 29, 2014 at 01:00:57AM +0100, Rafael J. Wysocki wrote: > > > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > > > > > > Use the observation that the ACPI scan handler of the device object > > > > in acpi_hotplug_notify_cb() can be obtained from that device object's > > > > handler pointer and do not pass it as data to > > > > acpi_install_hotplug_notify_handler() in acpi_scan_init_hotplug(). > > > > > > > > That allows the second argument of acpi_install_hotplug_notify_handler() > > > > to be dropped, so do it and update its callers accordingly. > > > > > > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > > --- > > > > drivers/acpi/scan.c | 31 ++++++++++++++++++------------- > > > > drivers/pci/hotplug/acpiphp_glue.c | 2 +- > > > > include/acpi/acpi_bus.h | 2 +- > > > > 3 files changed, 20 insertions(+), 15 deletions(-) > > > > > > > > Index: linux-pm/drivers/acpi/scan.c > > > > =================================================================== > > > > --- linux-pm.orig/drivers/acpi/scan.c > > > > +++ linux-pm/drivers/acpi/scan.c > > > > @@ -487,7 +487,6 @@ static void acpi_device_hotplug(void *da > > > > > > > > static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) > > > > { > > > > - struct acpi_scan_handler *handler = data; > > > > u32 ost_code = ACPI_OST_SC_SUCCESS; > > > > struct acpi_device *adev; > > > > acpi_status status; > > > > @@ -503,13 +502,6 @@ static void acpi_hotplug_notify_cb(acpi_ > > > > > > > > case ACPI_NOTIFY_EJECT_REQUEST: > > > > acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); > > > > - if (handler && !handler->hotplug.enabled) { > > > > - acpi_handle_err(handle, "Eject disabled\n"); > > > > - ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; > > > > - goto out; > > > > - } > > > > - acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, > > > > - ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); > > > > break; > > > > > > > > case ACPI_NOTIFY_DEVICE_WAKE: > > > > @@ -535,11 +527,24 @@ static void acpi_hotplug_notify_cb(acpi_ > > > > goto out; > > > > } > > > > > > > > + mutex_lock(&acpi_scan_lock); > > > > > > This is weird. I'm testing against your test-next branch which has this > > > patch included. If I remove locking here, TBT hotplug works fine. Otherwise > > > I can see the first hotplug/unplug works but after that I cannot get any > > > events anymore. > > > > Weird indeed. I don't seem to be able to reproduce that on my Aspire S5. > > > > What system are you testing on? > > This is Intel NUC. Let me see if I can reproduce this on S5 with longer > chain of devices. OK, so on S5 this works even with longer chain. However, exactly the same kernel image on NUC fails after first hotplug/unplug cycle. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Friday, January 31, 2014 06:01:57 PM Mika Westerberg wrote: > On Fri, Jan 31, 2014 at 05:40:11PM +0200, Mika Westerberg wrote: > > On Fri, Jan 31, 2014 at 04:42:21PM +0100, Rafael J. Wysocki wrote: > > > On Friday, January 31, 2014 05:28:36 PM Mika Westerberg wrote: > > > > On Wed, Jan 29, 2014 at 01:00:57AM +0100, Rafael J. Wysocki wrote: > > > > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > > > > > > > > Use the observation that the ACPI scan handler of the device object > > > > > in acpi_hotplug_notify_cb() can be obtained from that device object's > > > > > handler pointer and do not pass it as data to > > > > > acpi_install_hotplug_notify_handler() in acpi_scan_init_hotplug(). > > > > > > > > > > That allows the second argument of acpi_install_hotplug_notify_handler() > > > > > to be dropped, so do it and update its callers accordingly. > > > > > > > > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > > > --- > > > > > drivers/acpi/scan.c | 31 ++++++++++++++++++------------- > > > > > drivers/pci/hotplug/acpiphp_glue.c | 2 +- > > > > > include/acpi/acpi_bus.h | 2 +- > > > > > 3 files changed, 20 insertions(+), 15 deletions(-) > > > > > > > > > > Index: linux-pm/drivers/acpi/scan.c > > > > > =================================================================== > > > > > --- linux-pm.orig/drivers/acpi/scan.c > > > > > +++ linux-pm/drivers/acpi/scan.c > > > > > @@ -487,7 +487,6 @@ static void acpi_device_hotplug(void *da > > > > > > > > > > static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) > > > > > { > > > > > - struct acpi_scan_handler *handler = data; > > > > > u32 ost_code = ACPI_OST_SC_SUCCESS; > > > > > struct acpi_device *adev; > > > > > acpi_status status; > > > > > @@ -503,13 +502,6 @@ static void acpi_hotplug_notify_cb(acpi_ > > > > > > > > > > case ACPI_NOTIFY_EJECT_REQUEST: > > > > > acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); > > > > > - if (handler && !handler->hotplug.enabled) { > > > > > - acpi_handle_err(handle, "Eject disabled\n"); > > > > > - ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; > > > > > - goto out; > > > > > - } > > > > > - acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, > > > > > - ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); > > > > > break; > > > > > > > > > > case ACPI_NOTIFY_DEVICE_WAKE: > > > > > @@ -535,11 +527,24 @@ static void acpi_hotplug_notify_cb(acpi_ > > > > > goto out; > > > > > } > > > > > > > > > > + mutex_lock(&acpi_scan_lock); > > > > > > > > This is weird. I'm testing against your test-next branch which has this > > > > patch included. If I remove locking here, TBT hotplug works fine. Otherwise > > > > I can see the first hotplug/unplug works but after that I cannot get any > > > > events anymore. > > > > > > Weird indeed. I don't seem to be able to reproduce that on my Aspire S5. > > > > > > What system are you testing on? > > > > This is Intel NUC. Let me see if I can reproduce this on S5 with longer > > chain of devices. > > OK, so on S5 this works even with longer chain. However, exactly the same > kernel image on NUC fails after first hotplug/unplug cycle. Well, we need to figure out what happens there. Please add printks (1) before mutex_lock(), (2) before the if (type == ...) instruction, (3) before the acpi_evaluate_hotplug_ost() under the if () and (4) before the get_device() in acpi_notify_hotplug_cb() and check if they are all printed (on NUC).
On Fri, Jan 31, 2014 at 05:16:03PM +0100, Rafael J. Wysocki wrote: > On Friday, January 31, 2014 06:01:57 PM Mika Westerberg wrote: > > On Fri, Jan 31, 2014 at 05:40:11PM +0200, Mika Westerberg wrote: > > > On Fri, Jan 31, 2014 at 04:42:21PM +0100, Rafael J. Wysocki wrote: > > > > On Friday, January 31, 2014 05:28:36 PM Mika Westerberg wrote: > > > > > On Wed, Jan 29, 2014 at 01:00:57AM +0100, Rafael J. Wysocki wrote: > > > > > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > > > > > > > > > > Use the observation that the ACPI scan handler of the device object > > > > > > in acpi_hotplug_notify_cb() can be obtained from that device object's > > > > > > handler pointer and do not pass it as data to > > > > > > acpi_install_hotplug_notify_handler() in acpi_scan_init_hotplug(). > > > > > > > > > > > > That allows the second argument of acpi_install_hotplug_notify_handler() > > > > > > to be dropped, so do it and update its callers accordingly. > > > > > > > > > > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > > > > --- > > > > > > drivers/acpi/scan.c | 31 ++++++++++++++++++------------- > > > > > > drivers/pci/hotplug/acpiphp_glue.c | 2 +- > > > > > > include/acpi/acpi_bus.h | 2 +- > > > > > > 3 files changed, 20 insertions(+), 15 deletions(-) > > > > > > > > > > > > Index: linux-pm/drivers/acpi/scan.c > > > > > > =================================================================== > > > > > > --- linux-pm.orig/drivers/acpi/scan.c > > > > > > +++ linux-pm/drivers/acpi/scan.c > > > > > > @@ -487,7 +487,6 @@ static void acpi_device_hotplug(void *da > > > > > > > > > > > > static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) > > > > > > { > > > > > > - struct acpi_scan_handler *handler = data; > > > > > > u32 ost_code = ACPI_OST_SC_SUCCESS; > > > > > > struct acpi_device *adev; > > > > > > acpi_status status; > > > > > > @@ -503,13 +502,6 @@ static void acpi_hotplug_notify_cb(acpi_ > > > > > > > > > > > > case ACPI_NOTIFY_EJECT_REQUEST: > > > > > > acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); > > > > > > - if (handler && !handler->hotplug.enabled) { > > > > > > - acpi_handle_err(handle, "Eject disabled\n"); > > > > > > - ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; > > > > > > - goto out; > > > > > > - } > > > > > > - acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, > > > > > > - ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); > > > > > > break; > > > > > > > > > > > > case ACPI_NOTIFY_DEVICE_WAKE: > > > > > > @@ -535,11 +527,24 @@ static void acpi_hotplug_notify_cb(acpi_ > > > > > > goto out; > > > > > > } > > > > > > > > > > > > + mutex_lock(&acpi_scan_lock); > > > > > > > > > > This is weird. I'm testing against your test-next branch which has this > > > > > patch included. If I remove locking here, TBT hotplug works fine. Otherwise > > > > > I can see the first hotplug/unplug works but after that I cannot get any > > > > > events anymore. > > > > > > > > Weird indeed. I don't seem to be able to reproduce that on my Aspire S5. > > > > > > > > What system are you testing on? > > > > > > This is Intel NUC. Let me see if I can reproduce this on S5 with longer > > > chain of devices. > > > > OK, so on S5 this works even with longer chain. However, exactly the same > > kernel image on NUC fails after first hotplug/unplug cycle. > > Well, we need to figure out what happens there. > > Please add printks (1) before mutex_lock(), (2) before the if (type == ...) > instruction, (3) before the acpi_evaluate_hotplug_ost() under the if () and (4) > before the get_device() in acpi_notify_hotplug_cb() and check if they are all > printed (on NUC). Looks like something doesn't release that lock. I added printks what you suggested and after first hotplug/unplug last messages I get are: [ 64.914639] ACPI: \_SB_.PCI0.RP05: ACPI_NOTIFY_BUS_CHECK event [ 64.914640] ACPI: \_SB_.PCI0.RP05: BEFORE mutex_lock() Then running sysrq-w I get following task as blocked: [ 346.885950] SysRq : Show Blocked State [ 346.887733] task PC stack pid father [ 346.889535] kworker/0:0 D ffff880100241ae0 5280 4 2 0x00000000 [ 346.891355] Workqueue: kacpi_notify acpi_os_execute_deferred [ 346.893171] ffff8801003c7d30 0000000000000046 ffff880100241710 ffffffff81e10460 [ 346.895011] ffff8801003c7fd8 00000000000129c0 00000000000129c0 ffff880100241710 [ 346.896849] ffffffff81e5db70 ffffffff81e5db74 ffff880100241710 00000000ffffffff [ 346.898702] Call Trace: [ 346.900518] [<ffffffff81815bc4>] schedule_preempt_disabled+0x24/0x70 [ 346.902338] [<ffffffff818175f2>] __mutex_lock_slowpath+0x132/0x1b0 [ 346.904164] [<ffffffff8181768a>] mutex_lock+0x1a/0x2a [ 346.905993] [<ffffffff81324845>] acpi_hotplug_notify_cb+0x70/0x227 [ 346.907820] [<ffffffff813384f4>] acpi_ev_notify_dispatch+0x44/0x5c [ 346.909637] [<ffffffff8131fa8d>] acpi_os_execute_deferred+0xf/0x1b [ 346.911455] [<ffffffff8105e12a>] process_one_work+0x17a/0x440 [ 346.913285] [<ffffffff8105ed29>] worker_thread+0x119/0x390 [ 346.915121] [<ffffffff8105ec10>] ? manage_workers.isra.25+0x2a0/0x2a0 [ 346.916970] [<ffffffff81064dad>] kthread+0xcd/0xf0 [ 346.918809] [<ffffffff81064ce0>] ? kthread_create_on_node+0x180/0x180 [ 346.920653] [<ffffffff8181fefc>] ret_from_fork+0x7c/0xb0 [ 346.922501] [<ffffffff81064ce0>] ? kthread_create_on_node+0x180/0x180 [ 346.924351] kworker/u8:5 D ffff88006ea55860 4696 945 2 0x00000000 [ 346.926212] Workqueue: kacpi_hotplug acpi_hotplug_work_fn [ 346.928074] ffff88006de49a40 0000000000000046 ffff88006ea55490 ffff880100245490 [ 346.929978] ffff88006de49fd8 00000000000129c0 00000000000129c0 ffff88006ea55490 [ 346.931872] ffff88006de49ba0 7fffffffffffffff ffff88006de49b98 ffff88006ea55490 [ 346.933753] Call Trace: [ 346.935626] [<ffffffff81815794>] schedule+0x24/0x70 [ 346.937516] [<ffffffff81814a89>] schedule_timeout+0x1a9/0x2a0 [ 346.939415] [<ffffffff8107dda8>] ? __wake_up_common+0x58/0x90 [ 346.941312] [<ffffffff81816968>] wait_for_completion+0x98/0x100 [ 346.943222] [<ffffffff81071b70>] ? wake_up_state+0x10/0x10 [ 346.945133] [<ffffffff8105ba25>] flush_workqueue+0x115/0x5a0 [ 346.947054] [<ffffffff81309b20>] ? acpi_pci_find_companion+0x40/0x40 [ 346.948986] [<ffffffff81309b20>] ? acpi_pci_find_companion+0x40/0x40 [ 346.950904] [<ffffffff81320340>] acpi_os_wait_events_complete+0x1c/0x1e [ 346.952829] [<ffffffff8133a387>] acpi_remove_notify_handler+0x78/0x1ef [ 346.954748] [<ffffffff81309b20>] ? acpi_pci_find_companion+0x40/0x40 [ 346.956669] [<ffffffff813226df>] acpi_remove_pm_notifier+0x39/0x5c [ 346.958592] [<ffffffff81309ab5>] pci_acpi_cleanup+0x25/0x50 [ 346.960508] [<ffffffff8132368c>] acpi_platform_notify_remove+0x44/0x53 [ 346.962427] [<ffffffff814426f2>] device_del+0x142/0x1b0 [ 346.964333] [<ffffffff812edcfa>] pci_remove_bus_device+0x7a/0x100 [ 346.966238] [<ffffffff812edd95>] pci_stop_and_remove_bus_device+0x15/0x20 [ 346.968140] [<ffffffff8130639e>] disable_slot+0x4e/0xa0 [ 346.970030] [<ffffffff813067b8>] acpiphp_check_bridge.part.10+0xe8/0xf0 [ 346.971911] [<ffffffff81306f92>] hotplug_event+0xf2/0x1a0 [ 346.973776] [<ffffffff813070a1>] acpiphp_hotplug_event+0x61/0xe0 [ 346.975630] [<ffffffff8132634e>] acpi_device_hotplug+0x37c/0x3c2 [ 346.977471] [<ffffffff81320359>] acpi_hotplug_work_fn+0x17/0x22 [ 346.979299] [<ffffffff8105e12a>] process_one_work+0x17a/0x440 [ 346.981122] [<ffffffff8105ed29>] worker_thread+0x119/0x390 [ 346.982956] [<ffffffff8105ec10>] ? manage_workers.isra.25+0x2a0/0x2a0 [ 346.984762] [<ffffffff81064dad>] kthread+0xcd/0xf0 [ 346.986581] [<ffffffff81064ce0>] ? kthread_create_on_node+0x180/0x180 [ 346.988419] [<ffffffff8181fefc>] ret_from_fork+0x7c/0xb0 [ 346.990221] [<ffffffff81064ce0>] ? kthread_create_on_node+0x180/0x180 I have to leave now but I can continue debugging tomorrow if needed. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Friday, January 31, 2014 07:09:51 PM Mika Westerberg wrote: > On Fri, Jan 31, 2014 at 05:16:03PM +0100, Rafael J. Wysocki wrote: > > On Friday, January 31, 2014 06:01:57 PM Mika Westerberg wrote: > > > On Fri, Jan 31, 2014 at 05:40:11PM +0200, Mika Westerberg wrote: > > > > On Fri, Jan 31, 2014 at 04:42:21PM +0100, Rafael J. Wysocki wrote: > > > > > On Friday, January 31, 2014 05:28:36 PM Mika Westerberg wrote: > > > > > > On Wed, Jan 29, 2014 at 01:00:57AM +0100, Rafael J. Wysocki wrote: > > > > > > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > > > > > > > > > > > > Use the observation that the ACPI scan handler of the device object > > > > > > > in acpi_hotplug_notify_cb() can be obtained from that device object's > > > > > > > handler pointer and do not pass it as data to > > > > > > > acpi_install_hotplug_notify_handler() in acpi_scan_init_hotplug(). > > > > > > > > > > > > > > That allows the second argument of acpi_install_hotplug_notify_handler() > > > > > > > to be dropped, so do it and update its callers accordingly. > > > > > > > > > > > > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > > > > > --- > > > > > > > drivers/acpi/scan.c | 31 ++++++++++++++++++------------- > > > > > > > drivers/pci/hotplug/acpiphp_glue.c | 2 +- > > > > > > > include/acpi/acpi_bus.h | 2 +- > > > > > > > 3 files changed, 20 insertions(+), 15 deletions(-) > > > > > > > > > > > > > > Index: linux-pm/drivers/acpi/scan.c > > > > > > > =================================================================== > > > > > > > --- linux-pm.orig/drivers/acpi/scan.c > > > > > > > +++ linux-pm/drivers/acpi/scan.c > > > > > > > @@ -487,7 +487,6 @@ static void acpi_device_hotplug(void *da > > > > > > > > > > > > > > static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) > > > > > > > { > > > > > > > - struct acpi_scan_handler *handler = data; > > > > > > > u32 ost_code = ACPI_OST_SC_SUCCESS; > > > > > > > struct acpi_device *adev; > > > > > > > acpi_status status; > > > > > > > @@ -503,13 +502,6 @@ static void acpi_hotplug_notify_cb(acpi_ > > > > > > > > > > > > > > case ACPI_NOTIFY_EJECT_REQUEST: > > > > > > > acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); > > > > > > > - if (handler && !handler->hotplug.enabled) { > > > > > > > - acpi_handle_err(handle, "Eject disabled\n"); > > > > > > > - ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; > > > > > > > - goto out; > > > > > > > - } > > > > > > > - acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, > > > > > > > - ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); > > > > > > > break; > > > > > > > > > > > > > > case ACPI_NOTIFY_DEVICE_WAKE: > > > > > > > @@ -535,11 +527,24 @@ static void acpi_hotplug_notify_cb(acpi_ > > > > > > > goto out; > > > > > > > } > > > > > > > > > > > > > > + mutex_lock(&acpi_scan_lock); > > > > > > > > > > > > This is weird. I'm testing against your test-next branch which has this > > > > > > patch included. If I remove locking here, TBT hotplug works fine. Otherwise > > > > > > I can see the first hotplug/unplug works but after that I cannot get any > > > > > > events anymore. > > > > > > > > > > Weird indeed. I don't seem to be able to reproduce that on my Aspire S5. > > > > > > > > > > What system are you testing on? > > > > > > > > This is Intel NUC. Let me see if I can reproduce this on S5 with longer > > > > chain of devices. > > > > > > OK, so on S5 this works even with longer chain. However, exactly the same > > > kernel image on NUC fails after first hotplug/unplug cycle. > > > > Well, we need to figure out what happens there. > > > > Please add printks (1) before mutex_lock(), (2) before the if (type == ...) > > instruction, (3) before the acpi_evaluate_hotplug_ost() under the if () and (4) > > before the get_device() in acpi_notify_hotplug_cb() and check if they are all > > printed (on NUC). > > Looks like something doesn't release that lock. I added printks what you > suggested and after first hotplug/unplug last messages I get are: > > [ 64.914639] ACPI: \_SB_.PCI0.RP05: ACPI_NOTIFY_BUS_CHECK event > [ 64.914640] ACPI: \_SB_.PCI0.RP05: BEFORE mutex_lock() > > Then running sysrq-w I get following task as blocked: > > [ 346.885950] SysRq : Show Blocked State > [ 346.887733] task PC stack pid father > [ 346.889535] kworker/0:0 D ffff880100241ae0 5280 4 2 0x00000000 > [ 346.891355] Workqueue: kacpi_notify acpi_os_execute_deferred > [ 346.893171] ffff8801003c7d30 0000000000000046 ffff880100241710 ffffffff81e10460 > [ 346.895011] ffff8801003c7fd8 00000000000129c0 00000000000129c0 ffff880100241710 > [ 346.896849] ffffffff81e5db70 ffffffff81e5db74 ffff880100241710 00000000ffffffff > [ 346.898702] Call Trace: > [ 346.900518] [<ffffffff81815bc4>] schedule_preempt_disabled+0x24/0x70 > [ 346.902338] [<ffffffff818175f2>] __mutex_lock_slowpath+0x132/0x1b0 > [ 346.904164] [<ffffffff8181768a>] mutex_lock+0x1a/0x2a > [ 346.905993] [<ffffffff81324845>] acpi_hotplug_notify_cb+0x70/0x227 > [ 346.907820] [<ffffffff813384f4>] acpi_ev_notify_dispatch+0x44/0x5c > [ 346.909637] [<ffffffff8131fa8d>] acpi_os_execute_deferred+0xf/0x1b > [ 346.911455] [<ffffffff8105e12a>] process_one_work+0x17a/0x440 > [ 346.913285] [<ffffffff8105ed29>] worker_thread+0x119/0x390 > [ 346.915121] [<ffffffff8105ec10>] ? manage_workers.isra.25+0x2a0/0x2a0 > [ 346.916970] [<ffffffff81064dad>] kthread+0xcd/0xf0 > [ 346.918809] [<ffffffff81064ce0>] ? kthread_create_on_node+0x180/0x180 > [ 346.920653] [<ffffffff8181fefc>] ret_from_fork+0x7c/0xb0 > [ 346.922501] [<ffffffff81064ce0>] ? kthread_create_on_node+0x180/0x180 > [ 346.924351] kworker/u8:5 D ffff88006ea55860 4696 945 2 0x00000000 > [ 346.926212] Workqueue: kacpi_hotplug acpi_hotplug_work_fn > [ 346.928074] ffff88006de49a40 0000000000000046 ffff88006ea55490 ffff880100245490 > [ 346.929978] ffff88006de49fd8 00000000000129c0 00000000000129c0 ffff88006ea55490 > [ 346.931872] ffff88006de49ba0 7fffffffffffffff ffff88006de49b98 ffff88006ea55490 > [ 346.933753] Call Trace: > [ 346.935626] [<ffffffff81815794>] schedule+0x24/0x70 > [ 346.937516] [<ffffffff81814a89>] schedule_timeout+0x1a9/0x2a0 > [ 346.939415] [<ffffffff8107dda8>] ? __wake_up_common+0x58/0x90 > [ 346.941312] [<ffffffff81816968>] wait_for_completion+0x98/0x100 > [ 346.943222] [<ffffffff81071b70>] ? wake_up_state+0x10/0x10 > [ 346.945133] [<ffffffff8105ba25>] flush_workqueue+0x115/0x5a0 > [ 346.947054] [<ffffffff81309b20>] ? acpi_pci_find_companion+0x40/0x40 > [ 346.948986] [<ffffffff81309b20>] ? acpi_pci_find_companion+0x40/0x40 > [ 346.950904] [<ffffffff81320340>] acpi_os_wait_events_complete+0x1c/0x1e > [ 346.952829] [<ffffffff8133a387>] acpi_remove_notify_handler+0x78/0x1ef > [ 346.954748] [<ffffffff81309b20>] ? acpi_pci_find_companion+0x40/0x40 > [ 346.956669] [<ffffffff813226df>] acpi_remove_pm_notifier+0x39/0x5c > [ 346.958592] [<ffffffff81309ab5>] pci_acpi_cleanup+0x25/0x50 > [ 346.960508] [<ffffffff8132368c>] acpi_platform_notify_remove+0x44/0x53 > [ 346.962427] [<ffffffff814426f2>] device_del+0x142/0x1b0 > [ 346.964333] [<ffffffff812edcfa>] pci_remove_bus_device+0x7a/0x100 > [ 346.966238] [<ffffffff812edd95>] pci_stop_and_remove_bus_device+0x15/0x20 > [ 346.968140] [<ffffffff8130639e>] disable_slot+0x4e/0xa0 > [ 346.970030] [<ffffffff813067b8>] acpiphp_check_bridge.part.10+0xe8/0xf0 > [ 346.971911] [<ffffffff81306f92>] hotplug_event+0xf2/0x1a0 > [ 346.973776] [<ffffffff813070a1>] acpiphp_hotplug_event+0x61/0xe0 > [ 346.975630] [<ffffffff8132634e>] acpi_device_hotplug+0x37c/0x3c2 > [ 346.977471] [<ffffffff81320359>] acpi_hotplug_work_fn+0x17/0x22 > [ 346.979299] [<ffffffff8105e12a>] process_one_work+0x17a/0x440 > [ 346.981122] [<ffffffff8105ed29>] worker_thread+0x119/0x390 > [ 346.982956] [<ffffffff8105ec10>] ? manage_workers.isra.25+0x2a0/0x2a0 > [ 346.984762] [<ffffffff81064dad>] kthread+0xcd/0xf0 > [ 346.986581] [<ffffffff81064ce0>] ? kthread_create_on_node+0x180/0x180 > [ 346.988419] [<ffffffff8181fefc>] ret_from_fork+0x7c/0xb0 > [ 346.990221] [<ffffffff81064ce0>] ? kthread_create_on_node+0x180/0x180 > > I have to leave now but I can continue debugging tomorrow if needed. No need for now, I think I know what's happening. I'll follow up later. Thanks!
On Friday, January 31, 2014 06:34:22 PM Rafael J. Wysocki wrote: > On Friday, January 31, 2014 07:09:51 PM Mika Westerberg wrote: > > On Fri, Jan 31, 2014 at 05:16:03PM +0100, Rafael J. Wysocki wrote: [...] > > > > [ 64.914639] ACPI: \_SB_.PCI0.RP05: ACPI_NOTIFY_BUS_CHECK event > > [ 64.914640] ACPI: \_SB_.PCI0.RP05: BEFORE mutex_lock() > > > > Then running sysrq-w I get following task as blocked: > > > > [ 346.885950] SysRq : Show Blocked State > > [ 346.887733] task PC stack pid father > > [ 346.889535] kworker/0:0 D ffff880100241ae0 5280 4 2 0x00000000 > > [ 346.891355] Workqueue: kacpi_notify acpi_os_execute_deferred > > [ 346.893171] ffff8801003c7d30 0000000000000046 ffff880100241710 ffffffff81e10460 > > [ 346.895011] ffff8801003c7fd8 00000000000129c0 00000000000129c0 ffff880100241710 > > [ 346.896849] ffffffff81e5db70 ffffffff81e5db74 ffff880100241710 00000000ffffffff > > [ 346.898702] Call Trace: > > [ 346.900518] [<ffffffff81815bc4>] schedule_preempt_disabled+0x24/0x70 > > [ 346.902338] [<ffffffff818175f2>] __mutex_lock_slowpath+0x132/0x1b0 > > [ 346.904164] [<ffffffff8181768a>] mutex_lock+0x1a/0x2a > > [ 346.905993] [<ffffffff81324845>] acpi_hotplug_notify_cb+0x70/0x227 > > [ 346.907820] [<ffffffff813384f4>] acpi_ev_notify_dispatch+0x44/0x5c > > [ 346.909637] [<ffffffff8131fa8d>] acpi_os_execute_deferred+0xf/0x1b > > [ 346.911455] [<ffffffff8105e12a>] process_one_work+0x17a/0x440 > > [ 346.913285] [<ffffffff8105ed29>] worker_thread+0x119/0x390 > > [ 346.915121] [<ffffffff8105ec10>] ? manage_workers.isra.25+0x2a0/0x2a0 > > [ 346.916970] [<ffffffff81064dad>] kthread+0xcd/0xf0 > > [ 346.918809] [<ffffffff81064ce0>] ? kthread_create_on_node+0x180/0x180 > > [ 346.920653] [<ffffffff8181fefc>] ret_from_fork+0x7c/0xb0 > > [ 346.922501] [<ffffffff81064ce0>] ? kthread_create_on_node+0x180/0x180 > > [ 346.924351] kworker/u8:5 D ffff88006ea55860 4696 945 2 0x00000000 > > [ 346.926212] Workqueue: kacpi_hotplug acpi_hotplug_work_fn > > [ 346.928074] ffff88006de49a40 0000000000000046 ffff88006ea55490 ffff880100245490 > > [ 346.929978] ffff88006de49fd8 00000000000129c0 00000000000129c0 ffff88006ea55490 > > [ 346.931872] ffff88006de49ba0 7fffffffffffffff ffff88006de49b98 ffff88006ea55490 > > [ 346.933753] Call Trace: > > [ 346.935626] [<ffffffff81815794>] schedule+0x24/0x70 > > [ 346.937516] [<ffffffff81814a89>] schedule_timeout+0x1a9/0x2a0 > > [ 346.939415] [<ffffffff8107dda8>] ? __wake_up_common+0x58/0x90 > > [ 346.941312] [<ffffffff81816968>] wait_for_completion+0x98/0x100 > > [ 346.943222] [<ffffffff81071b70>] ? wake_up_state+0x10/0x10 > > [ 346.945133] [<ffffffff8105ba25>] flush_workqueue+0x115/0x5a0 > > [ 346.947054] [<ffffffff81309b20>] ? acpi_pci_find_companion+0x40/0x40 > > [ 346.948986] [<ffffffff81309b20>] ? acpi_pci_find_companion+0x40/0x40 > > [ 346.950904] [<ffffffff81320340>] acpi_os_wait_events_complete+0x1c/0x1e > > [ 346.952829] [<ffffffff8133a387>] acpi_remove_notify_handler+0x78/0x1ef > > [ 346.954748] [<ffffffff81309b20>] ? acpi_pci_find_companion+0x40/0x40 > > [ 346.956669] [<ffffffff813226df>] acpi_remove_pm_notifier+0x39/0x5c > > [ 346.958592] [<ffffffff81309ab5>] pci_acpi_cleanup+0x25/0x50 > > [ 346.960508] [<ffffffff8132368c>] acpi_platform_notify_remove+0x44/0x53 > > [ 346.962427] [<ffffffff814426f2>] device_del+0x142/0x1b0 > > [ 346.964333] [<ffffffff812edcfa>] pci_remove_bus_device+0x7a/0x100 > > [ 346.966238] [<ffffffff812edd95>] pci_stop_and_remove_bus_device+0x15/0x20 > > [ 346.968140] [<ffffffff8130639e>] disable_slot+0x4e/0xa0 > > [ 346.970030] [<ffffffff813067b8>] acpiphp_check_bridge.part.10+0xe8/0xf0 > > [ 346.971911] [<ffffffff81306f92>] hotplug_event+0xf2/0x1a0 > > [ 346.973776] [<ffffffff813070a1>] acpiphp_hotplug_event+0x61/0xe0 > > [ 346.975630] [<ffffffff8132634e>] acpi_device_hotplug+0x37c/0x3c2 > > [ 346.977471] [<ffffffff81320359>] acpi_hotplug_work_fn+0x17/0x22 > > [ 346.979299] [<ffffffff8105e12a>] process_one_work+0x17a/0x440 > > [ 346.981122] [<ffffffff8105ed29>] worker_thread+0x119/0x390 > > [ 346.982956] [<ffffffff8105ec10>] ? manage_workers.isra.25+0x2a0/0x2a0 > > [ 346.984762] [<ffffffff81064dad>] kthread+0xcd/0xf0 > > [ 346.986581] [<ffffffff81064ce0>] ? kthread_create_on_node+0x180/0x180 > > [ 346.988419] [<ffffffff8181fefc>] ret_from_fork+0x7c/0xb0 > > [ 346.990221] [<ffffffff81064ce0>] ? kthread_create_on_node+0x180/0x180 > > > > I have to leave now but I can continue debugging tomorrow if needed. > > No need for now, I think I know what's happening. I'll follow up later. acpi_remove_notify_handler() which is called from acpi_remove_pm_notifier() executes acpi_os_wait_events_complete() which does flush_workqueue(kacpi_notify_wq) and all that happens under acpi_scan_lock acquired by acpi_device_hotplug(). Now, acpi_hotplug_notify_cb() runs from kacpi_notify_wq, so effectively acpi_os_wait_events_complete() waits for it to return, so if it attempts to acquire acpi_scan_lock, it will deadlock. Which happens on the NUC. The good news is that we can use a different lock to eliminate the race I wanted to deal with using acpi_scan_lock, but that required me to rework the whole patchset. I'll send a new version shortly, but I need to update the ACPIPHP updates it is on top of. Thanks!
Index: linux-pm/drivers/acpi/scan.c =================================================================== --- linux-pm.orig/drivers/acpi/scan.c +++ linux-pm/drivers/acpi/scan.c @@ -487,7 +487,6 @@ static void acpi_device_hotplug(void *da static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) { - struct acpi_scan_handler *handler = data; u32 ost_code = ACPI_OST_SC_SUCCESS; struct acpi_device *adev; acpi_status status; @@ -503,13 +502,6 @@ static void acpi_hotplug_notify_cb(acpi_ case ACPI_NOTIFY_EJECT_REQUEST: acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); - if (handler && !handler->hotplug.enabled) { - acpi_handle_err(handle, "Eject disabled\n"); - ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; - goto out; - } - acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, - ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); break; case ACPI_NOTIFY_DEVICE_WAKE: @@ -535,11 +527,24 @@ static void acpi_hotplug_notify_cb(acpi_ goto out; } + mutex_lock(&acpi_scan_lock); ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; - if (acpi_bus_get_device(handle, &adev)) + if (acpi_bus_get_device(handle, &adev)) { + mutex_unlock(&acpi_scan_lock); goto out; - + } + if (type == ACPI_NOTIFY_EJECT_REQUEST) { + if (adev->handler && !adev->handler->hotplug.enabled) { + acpi_handle_err(handle, "Eject disabled\n"); + ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; + mutex_unlock(&acpi_scan_lock); + goto out; + } + acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, + ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); + } get_device(&adev->dev); + mutex_unlock(&acpi_scan_lock); status = acpi_hotplug_execute(acpi_device_hotplug, adev, type); if (ACPI_SUCCESS(status)) return; @@ -550,10 +555,10 @@ static void acpi_hotplug_notify_cb(acpi_ acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); } -void acpi_install_hotplug_notify_handler(acpi_handle handle, void *data) +void acpi_install_hotplug_notify_handler(acpi_handle handle) { acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, - acpi_hotplug_notify_cb, data); + acpi_hotplug_notify_cb, NULL); } void acpi_remove_hotplug_notify_handler(acpi_handle handle) @@ -2000,7 +2005,7 @@ static void acpi_scan_init_hotplug(acpi_ list_for_each_entry(hwid, &pnp.ids, list) { handler = acpi_scan_match_handler(hwid->id, NULL); if (handler) { - acpi_install_hotplug_notify_handler(handle, handler); + acpi_install_hotplug_notify_handler(handle); break; } } Index: linux-pm/drivers/pci/hotplug/acpiphp_glue.c =================================================================== --- linux-pm.orig/drivers/pci/hotplug/acpiphp_glue.c +++ linux-pm/drivers/pci/hotplug/acpiphp_glue.c @@ -371,7 +371,7 @@ static acpi_status register_slot(acpi_ha /* install notify handler */ if (!(newfunc->flags & FUNC_HAS_DCK)) - acpi_install_hotplug_notify_handler(handle, NULL); + acpi_install_hotplug_notify_handler(handle); return AE_OK; } Index: linux-pm/include/acpi/acpi_bus.h =================================================================== --- linux-pm.orig/include/acpi/acpi_bus.h +++ linux-pm/include/acpi/acpi_bus.h @@ -435,7 +435,7 @@ static inline bool acpi_device_enumerate typedef void (*acpi_hp_callback)(void *data, u32 src); acpi_status acpi_hotplug_execute(acpi_hp_callback func, void *data, u32 src); -void acpi_install_hotplug_notify_handler(acpi_handle handle, void *data); +void acpi_install_hotplug_notify_handler(acpi_handle handle); void acpi_remove_hotplug_notify_handler(acpi_handle handle); /**