ASoC: davinci-mcasp: Fix ruledata setup in davinci_mcasp_startup

Passing &mcasp->ruledata[dir] to snd_pcm_hw_rule_add() is not correct since
commit:
7b3d165a2821 ASoC: davinci-mcasp: Index ruledata in drvdata with substream->stream
now sets up the struct based on the substream->stream (0 or 1) while we pass
a pointer which we take with dir (1 or 2). This will lead kernel crash.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 7 insertions, 5 deletions

diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index 0b6b1b286201..bb4b78eada58 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -1128,6 +1128,8 @@ static int davinci_mcasp_startup(struct snd_pcm_substream *substream,
                                  struct snd_soc_dai *cpu_dai)
 {
         struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(cpu_dai);
+        struct davinci_mcasp_ruledata *ruledata =
+                                        &mcasp->ruledata[substream->stream];
         u32 max_channels = 0;
         int i, dir;
 
@@ -1149,7 +1151,7 @@ static int davinci_mcasp_startup(struct snd_pcm_substream *substream,
                 if (mcasp->serial_dir[i] == dir)
                         max_channels++;
         }
-        mcasp->ruledata[substream->stream].serializers = max_channels;
+        ruledata->serializers = max_channels;
         max_channels *= mcasp->tdm_slots;
         /*
          * If the already active stream has less channels than the calculated
@@ -1172,12 +1174,12 @@ static int davinci_mcasp_startup(struct snd_pcm_substream *substream,
         if (mcasp->bclk_master && mcasp->bclk_div == 0 && mcasp->sysclk_freq) {
                 int ret;
 
-                mcasp->ruledata[substream->stream].mcasp = mcasp;
+                ruledata->mcasp = mcasp;
 
                 ret = snd_pcm_hw_rule_add(substream->runtime, 0,
                                           SNDRV_PCM_HW_PARAM_RATE,
                                           davinci_mcasp_hw_rule_rate,
-                                          &mcasp->ruledata[dir],
+                                          ruledata,
                                           SNDRV_PCM_HW_PARAM_FORMAT,
                                           SNDRV_PCM_HW_PARAM_CHANNELS, -1);
                 if (ret)
@@ -1185,7 +1187,7 @@ static int davinci_mcasp_startup(struct snd_pcm_substream *substream,
                 ret = snd_pcm_hw_rule_add(substream->runtime, 0,
                                           SNDRV_PCM_HW_PARAM_FORMAT,
                                           davinci_mcasp_hw_rule_format,
-                                          &mcasp->ruledata[dir],
+                                          ruledata,
                                           SNDRV_PCM_HW_PARAM_RATE,
                                           SNDRV_PCM_HW_PARAM_CHANNELS, -1);
                 if (ret)
@@ -1193,7 +1195,7 @@ static int davinci_mcasp_startup(struct snd_pcm_substream *substream,
                 ret = snd_pcm_hw_rule_add(substream->runtime, 0,
                                           SNDRV_PCM_HW_PARAM_CHANNELS,
                                           davinci_mcasp_hw_rule_channels,
-                                          &mcasp->ruledata[dir],
+                                          ruledata,
                                           SNDRV_PCM_HW_PARAM_RATE,
                                           SNDRV_PCM_HW_PARAM_FORMAT, -1);
                 if (ret)