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ALSA: Fix SNDCTL_DSP_RESET ioctl for OSS emulation 

In OSS emulation, SNDCTL_DSP_RESET ioctl needs the reset of the internal
buffer state in addition to drop of the running streams.  Otherwise the
succeeding access becomes inconsistent.

Tested-by: Amit Nagal <helloin.amit@gmail.com>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2010-11-30 08:14:21 +01:00
parent ac70eb1305
commit 60686aa008
1 changed files with 11 additions and 8 deletions
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19
sound/core/oss/pcm_oss.c
View File

@ -1510,16 +1510,19 @@ static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __use
static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
{
struct snd_pcm_substream *substream;
struct snd_pcm_runtime *runtime;
int i;
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
if (substream != NULL) {
for (i = 0; i < 2; i++) {
substream = pcm_oss_file->streams[i];
if (!substream)
continue;
runtime = substream->runtime;
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
substream->runtime->oss.prepare = 1;
}
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
if (substream != NULL) {
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
substream->runtime->oss.prepare = 1;
runtime->oss.prepare = 1;
runtime->oss.buffer_used = 0;
runtime->oss.prev_hw_ptr_period = 0;
runtime->oss.period_ptr = 0;
}
return 0;
}