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authorRaymond Yau <superquad.vortex2@gmail.com>2011-01-16 10:55:54 +0800
committerTakashi Iwai <tiwai@suse.de>2011-01-17 11:04:01 +0100
commitd9ab344336f74c012f6643ed3d1ad8ca0136de3b (patch)
tree5a858bfefef38b288af7f9e94f1bb3a5714eedef /sound/pci/au88x0
parent3e8b3b90fecedcf20d895c4e6ad01a379fe252bf (diff)
ALSA : au88x0 - Limit number of channels to fix Oops via OSS emu
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>
Diffstat (limited to 'sound/pci/au88x0')
-rw-r--r--sound/pci/au88x0/au88x0_pcm.c24
1 files changed, 20 insertions, 4 deletions
diff --git a/sound/pci/au88x0/au88x0_pcm.c b/sound/pci/au88x0/au88x0_pcm.c
index b9d2f202cf9b..5439d662d104 100644
--- a/sound/pci/au88x0/au88x0_pcm.c
+++ b/sound/pci/au88x0/au88x0_pcm.c
@@ -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