diff options
| author | Mauro Carvalho Chehab <mchehab@redhat.com> | 2008-11-24 08:45:57 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2008-11-24 12:24:52 -0200 |
| commit | 50f3beb50abe0cc0228363af804e50e710b3e5b0 (patch) | |
| tree | fe189ffd9fd3caf67202a6f417d2da7e5ffe03d5 /drivers | |
| parent | 7a8f4ccfd572a11f609439dc6a75165b441641bc (diff) | |
| download | lwn-50f3beb50abe0cc0228363af804e50e710b3e5b0.tar.gz lwn-50f3beb50abe0cc0228363af804e50e710b3e5b0.zip | |
V4L/DVB (9742): em28xx-alsa: implement another locking schema
Instead of using a spinlock, it is better to call the proper pcm stream
locking schema.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/video/em28xx/em28xx-audio.c | 37 |
1 files changed, 24 insertions, 13 deletions
diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c index ac3292d7646c..dfac2e042a52 100644 --- a/drivers/media/video/em28xx/em28xx-audio.c +++ b/drivers/media/video/em28xx/em28xx-audio.c @@ -75,7 +75,9 @@ static void em28xx_audio_isocirq(struct urb *urb) struct em28xx *dev = urb->context; int i; unsigned int oldptr; +#ifdef NO_PCM_LOCK unsigned long flags; +#endif int period_elapsed = 0; int status; unsigned char *cp; @@ -96,9 +98,26 @@ static void em28xx_audio_isocirq(struct urb *urb) if (!length) continue; +#ifdef NO_PCM_LOCK spin_lock_irqsave(&dev->adev->slock, flags); - +#endif oldptr = dev->adev->hwptr_done_capture; + if (oldptr + length >= runtime->buffer_size) { + unsigned int cnt = + runtime->buffer_size - oldptr; + memcpy(runtime->dma_area + oldptr * stride, cp, + cnt * stride); + memcpy(runtime->dma_area, cp + cnt * stride, + length * stride - cnt * stride); + } else { + memcpy(runtime->dma_area + oldptr * stride, cp, + length * stride); + } + +#ifndef NO_PCM_LOCK + snd_pcm_stream_lock(substream); +#endif + dev->adev->hwptr_done_capture += length; if (dev->adev->hwptr_done_capture >= runtime->buffer_size) @@ -113,19 +132,11 @@ static void em28xx_audio_isocirq(struct urb *urb) period_elapsed = 1; } +#ifdef NO_PCM_LOCK spin_unlock_irqrestore(&dev->adev->slock, flags); - - if (oldptr + length >= runtime->buffer_size) { - unsigned int cnt = - runtime->buffer_size - oldptr; - memcpy(runtime->dma_area + oldptr * stride, cp, - cnt * stride); - memcpy(runtime->dma_area, cp + cnt * stride, - length * stride - cnt * stride); - } else { - memcpy(runtime->dma_area + oldptr * stride, cp, - length * stride); - } +#else + snd_pcm_stream_unlock(substream); +#endif } if (period_elapsed) snd_pcm_period_elapsed(substream); |