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ALSA: line6: Fix the error recovery in line6_pcm_acquire() 

line6_pcm_acquire() tries to restore the newly obtained resources at
the error path.  But some flags aren't recorded and released properly
when the corresponding buffer is already present.  These bits have to
be cleared in the error recovery, too.

Also, "flags_final" can be initialized to zero since we pass only the
subset of "channels" bits.

Tested-by: Chris Rorvick <chris@rorvick.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-01-23 14:34:42 +01:00
parent 6aa7f8ef29
commit 5343ecf4e5
1 changed files with 6 additions and 6 deletions
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12
sound/usb/line6/pcm.c
View File

@ -106,7 +106,7 @@ int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int channels)
flags_new = flags_old | channels;
} while (cmpxchg(&line6pcm->flags, flags_old, flags_new) != flags_old);
flags_final = flags_old;
flags_final = 0;
line6pcm->prev_fbuf = NULL;
@ -120,9 +120,9 @@ int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int channels)
err = -ENOMEM;
goto pcm_acquire_error;
}
flags_final |= channels & LINE6_BITS_CAPTURE_BUFFER;
}
flags_final |= channels & LINE6_BITS_CAPTURE_BUFFER;
}
if (test_flags(flags_old, flags_new, LINE6_BITS_CAPTURE_STREAM)) {
@ -157,9 +157,9 @@ int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int channels)
err = -ENOMEM;
goto pcm_acquire_error;
}
flags_final |= channels & LINE6_BITS_PLAYBACK_BUFFER;
}
flags_final |= channels & LINE6_BITS_PLAYBACK_BUFFER;
}
if (test_flags(flags_old, flags_new, LINE6_BITS_PLAYBACK_STREAM)) {
@ -187,7 +187,7 @@ pcm_acquire_error:
If not all requested resources/streams could be obtained, release
those which were successfully obtained (if any).
*/
line6_pcm_release(line6pcm, flags_final & channels);
line6_pcm_release(line6pcm, flags_final);
return err;
}
EXPORT_SYMBOL_GPL(line6_pcm_acquire);