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USB: Fix LPM disable count mismatch on driver unbind.

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When a user runs `echo 0 > bConfigurationValue` for a USB 3.0 device,
usb_disable_device() is called.  This function disables all drivers,
deallocates interfaces, and sets the device configuration value to 0
(unconfigured).

With the new scheme to ensure that unconfigured devices have LPM
disabled, usb_disable_device() must call usb_unlocked_disable_lpm() once
it unconfigures the device.

This commit 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>
Cc: stable@vger.kernel.org
This commit is contained in:
Sarah Sharp 2012-07-05 14:09:30 -07:00
parent 9cf65991dd
commit 249719121b
1 changed files with 1 additions and 0 deletions
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1
drivers/usb/core/message.c
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@ -1174,6 +1174,7 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0)
put_device(&dev->actconfig->interface[i]->dev);
dev->actconfig->interface[i] = NULL;
}
usb_unlocked_disable_lpm(dev);
dev->actconfig = NULL;
if (dev->state == USB_STATE_CONFIGURED)
usb_set_device_state(dev, USB_STATE_ADDRESS);