From: Johan Hovold johan@kernel.org
commit 30045f2174aab7fb4db7a9cf902d0aa6c75856a7 upstream.
Since commit c2b71462d294 ("USB: core: Fix bug caused by duplicate interface PM usage counter") USB drivers must always balance their runtime PM gets and puts, including when the driver has already been unbound from the interface.
Leaving the interface with a positive PM usage counter would prevent a later bound driver from suspending the device.
Note that runtime PM has never actually been enabled for this driver since the support_autosuspend flag in its usb_driver struct is not set.
Fixes: c2b71462d294 ("USB: core: Fix bug caused by duplicate interface PM usage counter") Cc: stable stable@vger.kernel.org Acked-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org Signed-off-by: Johan Hovold johan@kernel.org Link: https://lore.kernel.org/r/20191001084908.2003-5-johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/media/usb/stkwebcam/stk-webcam.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/media/usb/stkwebcam/stk-webcam.c +++ b/drivers/media/usb/stkwebcam/stk-webcam.c @@ -647,8 +647,7 @@ static int v4l_stk_release(struct file * dev->owner = NULL; }
- if (is_present(dev)) - usb_autopm_put_interface(dev->interface); + usb_autopm_put_interface(dev->interface); mutex_unlock(&dev->lock); return v4l2_fh_release(fp); }