tree a92fd6b4d300b3ec750df1503bfe3af61cb19aac
parent 9bc889b4ba88a3f2d81e4b799d47d71d7381573a
author Takashi Iwai <tiwai@suse.de> 1415275489 +0100
committer Takashi Iwai <tiwai@suse.de> 1415275489 +0100

ALSA: usb-audio: Trigger PCM XRUN at XRUN

The usb-audio driver detects XRUN at its complete callback, but the
actual code to trigger PCM XRUN is commented out because it caused
deadlock in the past.  This patch revives the PCM trigger properly.
It resulted in more than just enabling snd_pcm_stop(), but it had to
deduce the PCM substream with proper NULL checks and holds the stream
lock around the call.

Signed-off-by: Takashi Iwai <tiwai@suse.de>