| Message ID | 1514925904-24001-1-git-send-email-okaya@codeaurora.org |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | misc: rtsx: release IRQ during shutdown | expand |
On Tue, Jan 2, 2018 at 9:45 PM, Sinan Kaya <okaya@codeaurora.org> wrote: > 'Commit cc27b735ad3a ("PCI/portdrv: Turn off PCIe services during > shutdown")' revealed a resource leak in rtsx_pci driver during shutdown. > > Issue shows up as a warning during the shutdown step as follows: > > remove_proc_entry: removing non-empty directory 'irq/17', leaking at least > 'rtsx_pci' > WARNING: CPU: 0 PID: 1578 at fs/proc/generic.c:572 > remove_proc_entry+0x11d/0x130 > Modules linked in <long list but none that are out-of-tree> > ... > Call Trace: > unregister_irq_proc > free_desc > irq_free_descs > mp_unmap_irq > acpi_unregister_gsi_apic > acpi_pci_irq_disable > do_pci_disable_device > pci_disable_device > device_shutdown > kernel_restart > Sys_reboot > > Even though rtsx_pci driver implements a shutdown callback, it is not > releasing the interrupt that it registered during probe. This is causing > the ACPI layer to complain that the shared IRQ is in use while freeing > IRQ. > > This code releases the IRQ to prevent resource leak and eliminate the > warning. > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=198141 > Reported-by: Chris Clayton <chris2553@googlemail.com> > Fixes: cc27b735ad3a ("PCI/portdrv: Turn off PCIe services during shutdown") > Tested-by: Chris Clayton <chris2553@googlemail.com> > Signed-off-by: Sinan Kaya <okaya@codeaurora.org> > --- > drivers/mfd/rtsx_pcr.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/mfd/rtsx_pcr.c b/drivers/mfd/rtsx_pcr.c > index 590fb9a..bd504b6 100644 > --- a/drivers/mfd/rtsx_pcr.c > +++ b/drivers/mfd/rtsx_pcr.c > @@ -1543,6 +1543,7 @@ static void rtsx_pci_shutdown(struct pci_dev *pcidev) > rtsx_pci_power_off(pcr, HOST_ENTER_S1); > > pci_disable_device(pcidev); > + free_irq(pcr->irq, (void *)pcr); Do you need to disable MSI here too? > } > > #else /* CONFIG_PM */ > --
On 1/3/2018 7:06 AM, Rafael J. Wysocki wrote: >> pci_disable_device(pcidev); >> + free_irq(pcr->irq, (void *)pcr); > Do you need to disable MSI here too? > Makes sense. I'll post V2 in a minute.
diff --git a/drivers/mfd/rtsx_pcr.c b/drivers/mfd/rtsx_pcr.c index 590fb9a..bd504b6 100644 --- a/drivers/mfd/rtsx_pcr.c +++ b/drivers/mfd/rtsx_pcr.c @@ -1543,6 +1543,7 @@ static void rtsx_pci_shutdown(struct pci_dev *pcidev) rtsx_pci_power_off(pcr, HOST_ENTER_S1); pci_disable_device(pcidev); + free_irq(pcr->irq, (void *)pcr); } #else /* CONFIG_PM */
'Commit cc27b735ad3a ("PCI/portdrv: Turn off PCIe services during shutdown")' revealed a resource leak in rtsx_pci driver during shutdown. Issue shows up as a warning during the shutdown step as follows: remove_proc_entry: removing non-empty directory 'irq/17', leaking at least 'rtsx_pci' WARNING: CPU: 0 PID: 1578 at fs/proc/generic.c:572 remove_proc_entry+0x11d/0x130 Modules linked in <long list but none that are out-of-tree> ... Call Trace: unregister_irq_proc free_desc irq_free_descs mp_unmap_irq acpi_unregister_gsi_apic acpi_pci_irq_disable do_pci_disable_device pci_disable_device device_shutdown kernel_restart Sys_reboot Even though rtsx_pci driver implements a shutdown callback, it is not releasing the interrupt that it registered during probe. This is causing the ACPI layer to complain that the shared IRQ is in use while freeing IRQ. This code releases the IRQ to prevent resource leak and eliminate the warning. Link: https://bugzilla.kernel.org/show_bug.cgi?id=198141 Reported-by: Chris Clayton <chris2553@googlemail.com> Fixes: cc27b735ad3a ("PCI/portdrv: Turn off PCIe services during shutdown") Tested-by: Chris Clayton <chris2553@googlemail.com> Signed-off-by: Sinan Kaya <okaya@codeaurora.org> --- drivers/mfd/rtsx_pcr.c | 1 + 1 file changed, 1 insertion(+)