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ALSA: line6: Clear prev_fbuf and prev_fsize properly

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Clearing prev_fsize in line6_pcm_acquire() is pretty racy.
This can be called at any time while the stream is being played.
Rather better to clear prev_fbuf and prev_fsize at the proper place
like the stream stop for capture, and just after copying the monitor /
impulse data inside the spinlock.

Tested-by: Chris Rorvick <chris@rorvick.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-01-27 16:17:26 +01:00
parent 3d3ae4454d
commit f2bb614bb6
2 changed files with 7 additions and 7 deletions
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8
sound/usb/line6/pcm.c
View File

@ -171,8 +171,6 @@ int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int channels)
flags_final = 0;
line6pcm->prev_fbuf = NULL;
if (test_flags(flags_old, flags_new, LINE6_BITS_CAPTURE_BUFFER)) {
err = line6_alloc_stream_buffer(line6pcm, &line6pcm->in);
if (err < 0)
@ -193,7 +191,6 @@ int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int channels)
}
line6pcm->in.count = 0;
line6pcm->prev_fsize = 0;
err = line6_submit_audio_in_all_urbs(line6pcm);
if (err < 0)
@ -248,8 +245,11 @@ int line6_pcm_release(struct snd_line6_pcm *line6pcm, int channels)
flags_new = flags_old & ~channels;
} while (cmpxchg(&line6pcm->flags, flags_old, flags_new) != flags_old);
if (test_flags(flags_new, flags_old, LINE6_BITS_CAPTURE_STREAM))
if (test_flags(flags_new, flags_old, LINE6_BITS_CAPTURE_STREAM)) {
line6_unlink_audio_urbs(line6pcm, &line6pcm->in);
line6pcm->prev_fbuf = NULL;
line6pcm->prev_fsize = 0;
}
if (test_flags(flags_new, flags_old, LINE6_BITS_CAPTURE_BUFFER)) {
line6_wait_clear_audio_urbs(line6pcm, &line6pcm->in);

4
sound/usb/line6/playback.c
View File

@ -166,9 +166,7 @@ static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
struct usb_iso_packet_descriptor *fout =
&urb_out->iso_frame_desc[i];
if (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM)
fsize = line6pcm->prev_fsize;
if (fsize == 0) {
int n;
@ -263,6 +261,8 @@ static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
line6pcm->volume_monitor,
bytes_per_frame);
}
line6pcm->prev_fbuf = NULL;
line6pcm->prev_fsize = 0;
}
spin_unlock(&line6pcm->in.lock);