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authorTakashi Iwai <tiwai@suse.de>2015-01-27 16:17:26 +0100
committerTakashi Iwai <tiwai@suse.de>2015-01-28 07:22:30 +0100
commitf2bb614bb6c7f5245521195f144272ef93d9f086 (patch)
tree2e491dc66f9805f1872e2c7a141dc38da30f4d81 /sound/usb
parent3d3ae4454deb94bbad9ad0b2b559cbf6c0db4ec2 (diff)
downloadlinux-f2bb614bb6c7f5245521195f144272ef93d9f086.tar.bz2
ALSA: line6: Clear prev_fbuf and prev_fsize properly
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>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/line6/pcm.c8
-rw-r--r--sound/usb/line6/playback.c6
2 files changed, 7 insertions, 7 deletions
diff --git a/sound/usb/line6/pcm.c b/sound/usb/line6/pcm.c
index f75825995e24..dedbe24cbf60 100644
--- a/sound/usb/line6/pcm.c
+++ b/sound/usb/line6/pcm.c
@@ -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);
diff --git a/sound/usb/line6/playback.c b/sound/usb/line6/playback.c
index b4a26d0c8267..242265929145 100644
--- a/sound/usb/line6/playback.c
+++ b/sound/usb/line6/playback.c
@@ -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;
-
+ 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);