Jonathan Bell 75bc2dd40d
sound/usb: call usb_autopm_get_interface() for devices that should not ...
be suspended
Webcams with microphones are composite devices, and autosuspend is set
at the device level. If uvcvideo is probed after snd-usb-audio, the effect
of the quirk applied by snd-usb-audio is undone by uvcvideo's global
application of autosuspend.
Incrementing the interface's PM refcount in such cases prevents runtime PM
from happening, thus the device is left active.
Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com >
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