[ALSA] Fix hang-up at disconnection of usb-audio
Fix hang-up at disconnection of usb-audio devices while accessing PCM. Don't handle PCM operations any more after shutdown flag is set. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
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282e0c87
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