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ALSA : au88x0 - Limit number of channels to fix Oops via OSS emu

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Fix playback/capture channels patch to change supported playback
channels of au8830 to 1,2,4 and capture channels to 1,2.
This prevent oops when oss emulation use SNDCTL_DSP_CHANNELS to
set 3 Channels

Signed-off-by: Raymond Yau <superquad.vortex2@gmail.com>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Raymond Yau 2011-01-16 10:55:54 +08:00 committed by Takashi Iwai
parent 3e8b3b90fe
commit d9ab344336
1 changed files with 20 additions and 4 deletions
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24
sound/pci/au88x0/au88x0_pcm.c
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@ -42,11 +42,7 @@ static struct snd_pcm_hardware snd_vortex_playback_hw_adb = {
.rate_min = 5000,
.rate_max = 48000,
.channels_min = 1,
#ifdef CHIP_AU8830
.channels_max = 4,
#else
.channels_max = 2,
#endif
.buffer_bytes_max = 0x10000,
.period_bytes_min = 0x1,
.period_bytes_max = 0x1000,
@ -115,6 +111,17 @@ static struct snd_pcm_hardware snd_vortex_playback_hw_wt = {
.periods_max = 64,
};
#endif
#ifdef CHIP_AU8830
static unsigned int au8830_channels[3] = {
1, 2, 4,
};
static struct snd_pcm_hw_constraint_list hw_constraints_au8830_channels = {
.count = ARRAY_SIZE(au8830_channels),
.list = au8830_channels,
.mask = 0,
};
#endif
/* open callback */
static int snd_vortex_pcm_open(struct snd_pcm_substream *substream)
{
@ -156,6 +163,15 @@ static int snd_vortex_pcm_open(struct snd_pcm_substream *substream)
if (VORTEX_PCM_TYPE(substream->pcm) == VORTEX_PCM_ADB
|| VORTEX_PCM_TYPE(substream->pcm) == VORTEX_PCM_I2S)
runtime->hw = snd_vortex_playback_hw_adb;
#ifdef CHIP_AU8830
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
VORTEX_PCM_TYPE(substream->pcm) == VORTEX_PCM_ADB) {
runtime->hw.channels_max = 4;
snd_pcm_hw_constraint_list(runtime, 0,
SNDRV_PCM_HW_PARAM_CHANNELS,
&hw_constraints_au8830_channels);
}
#endif
substream->runtime->private_data = NULL;
}
#ifndef CHIP_AU8810