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>

diff --git a/sound/pci/au88x0/au88x0_pcm.c b/sound/pci/au88x0/au88x0_pcm.c
index b9d2f202cf9b4385db4291d5fb919cf6365525ab..5439d662d1047377ddd7d832dbd1791e0ce887fe 100644 (file)
--- 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