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media: stkwebcam: fix runtime PM after driver unbind

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Since commit c2b71462d2 ("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: c2b71462d2 ("USB: core: Fix bug caused by duplicate interface PM usage counter")
Cc: stable <[email protected]>
Acked-by: Mauro Carvalho Chehab <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Johan Hovold 2019-10-01 10:49:08 +02:00 • committed by Greg Kroah-Hartman
commit 30045f2174
1 changed files with 1 additions and 2 deletions
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3
drivers/media/usb/stkwebcam/stk-webcam.c
View file

@ -643,8 +643,7 @@ static int v4l_stk_release(struct file *fp)
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);
}