Commit 24971912 authored Jul 05, 2012 by Sarah Sharp

USB: Fix LPM disable count mismatch on driver unbind.



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 8306095f "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

parent 9cf65991

drivers/usb/core/message.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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);