ASoC: tegra+wm8903: turn of mic detect when card is removed

If mic detect is left enabled and the WM8903 detects a status change,
the WM8903 driver will make a callback against the free()d jack, which
will cause a crash.

This problem can be triggered by fully initializing an audio card, then
removing and re-inserting the machine driver module.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/sound/soc/tegra/tegra_wm8903.c b/sound/soc/tegra/tegra_wm8903.c
index 0b0df49d9d33..3b6da91188a9 100644
--- a/sound/soc/tegra/tegra_wm8903.c
+++ b/sound/soc/tegra/tegra_wm8903.c
@@ -346,6 +346,17 @@ static int tegra_wm8903_init(struct snd_soc_pcm_runtime *rtd)
         return 0;
 }
 
+static int tegra_wm8903_remove(struct snd_soc_card *card)
+{
+        struct snd_soc_pcm_runtime *rtd = &(card->rtd[0]);
+        struct snd_soc_dai *codec_dai = rtd->codec_dai;
+        struct snd_soc_codec *codec = codec_dai->codec;
+
+        wm8903_mic_detect(codec, NULL, 0, 0);
+
+        return 0;
+}
+
 static struct snd_soc_dai_link tegra_wm8903_dai = {
         .name = "WM8903",
         .stream_name = "WM8903 PCM",
@@ -363,6 +374,8 @@ static struct snd_soc_card snd_soc_tegra_wm8903 = {
         .dai_link = &tegra_wm8903_dai,
         .num_links = 1,
 
+        .remove = tegra_wm8903_remove,
+
         .controls = tegra_wm8903_controls,
         .num_controls = ARRAY_SIZE(tegra_wm8903_controls),
         .dapm_widgets = tegra_wm8903_dapm_widgets,