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ALSA: line6: Fix -EBUSY error during active monitoring 

When a monitor stream is active, the next PCM stream access results in
EBUSY error because of the check in line6_stream_start().  Fix this by
just skipping the submission of pending URBs when the stream is
already running instead.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=101431
Cc: <stable@vger.kernel.org> # v4.0+
Signed-off-by: Takashi Iwai <tiwai@suse.de>
hifive-unleashed-5.1
Takashi Iwai 2015-07-14 15:19:37 +02:00
parent d1f15e06b2
commit 4d0e677523
1 changed files with 2 additions and 7 deletions
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9
sound/usb/line6/pcm.c
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@ -186,12 +186,8 @@ static int line6_stream_start(struct snd_line6_pcm *line6pcm, int direction,
int ret = 0;
spin_lock_irqsave(&pstr->lock, flags);
if (!test_and_set_bit(type, &pstr->running)) {
if (pstr->active_urbs || pstr->unlink_urbs) {
ret = -EBUSY;
goto error;
}
if (!test_and_set_bit(type, &pstr->running) &&
!(pstr->active_urbs || pstr->unlink_urbs)) {
pstr->count = 0;
/* Submit all currently available URBs */
if (direction == SNDRV_PCM_STREAM_PLAYBACK)
@ -199,7 +195,6 @@ static int line6_stream_start(struct snd_line6_pcm *line6pcm, int direction,
else
ret = line6_submit_audio_in_all_urbs(line6pcm);
}
error:
if (ret < 0)
clear_bit(type, &pstr->running);
spin_unlock_irqrestore(&pstr->lock, flags);