| From | Greg Kroah-Hartman <> | Subject | [ 035/122] USB: Fix LPM disable count mismatch on driver unbind. | Date | Tue, 7 Aug 2012 15:25:23 -0700 |
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From: Greg KH <gregkh@linuxfoundation.org>
3.5-stable review patch. If anyone has any objections, please let me know.
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From: Sarah Sharp <sarah.a.sharp@linux.intel.com>
commit 249719121bc2b841bdfcab5eb21b10d8b871743b upstream.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/usb/core/message.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -1174,6 +1174,7 @@ void usb_disable_device(struct usb_devic 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);
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