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V4L/DVB (9742): em28xx-alsa: implement another locking schema

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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>
This commit is contained in:
Mauro Carvalho Chehab 2008-11-24 08:45:57 -03:00
parent 7a8f4ccfd5
commit 50f3beb50a
1 changed files with 24 additions and 13 deletions
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37
drivers/media/video/em28xx/em28xx-audio.c
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@ -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);