| Message ID | 1353474498-8152-1-git-send-email-herton.krzesinski@canonical.com |
|---|---|
| State | New |
| Headers | show |
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index f536aeb..da33079 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -371,6 +371,10 @@ static int usb_probe_interface(struct device *dev) intf->condition = USB_INTERFACE_UNBOUND; usb_cancel_queued_reset(intf); + /* If the LPM disable succeeded, balance the ref counts. */ + if (!lpm_disable_error) + usb_unlocked_enable_lpm(udev); + /* Unbound interfaces are always runtime-PM-disabled and -suspended */ if (driver->supports_autosuspend) pm_runtime_disable(dev);
This is a note to let you know that I have just added a patch titled USB: Enable LPM after a failed probe. to the linux-3.5.y-queue branch of the 3.5.yuz extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.5.yuz tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Herton ------ From b4a1fc226724e17594b7bc855ff415d8db3e0d83 Mon Sep 17 00:00:00 2001 From: Sarah Sharp <sarah.a.sharp@linux.intel.com> Date: Thu, 4 Oct 2012 09:53:43 -0700 Subject: [PATCH] USB: Enable LPM after a failed probe. commit d01f87c0ffa96cb44faa78710711eb6e974b891c upstream. Before a driver is probed, we want to disable USB 3.0 Link Power Management (LPM), in case the driver needs hub-initiated LPM disabled. After the probe finishes, we want to attempt to re-enable LPM, order to balance the LPM ref count. When a probe fails (such as when libusual doesn't want to bind to a USB 3.0 mass storage device), make sure to balance the LPM ref counts by re-enabling LPM. This patch should be backported to kernels as old as 3.5, that contain the commit 8306095fd2c1100e8244c09bf560f97aca5a311d "USB: Disable USB 3.0 LPM in critical sections." Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com> --- drivers/usb/core/driver.c | 4 ++++ 1 file changed, 4 insertions(+) -- 1.7.9.5