ASoC: DAPM: Make sure DAPM widget IO ops hold the component mutex

Currently not all DAPM widget IO ops are holding their component mutex
(codec or platform). Make sure this is now held for DAPM widget IO operations.

Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 42602ddea24389dc6d40cfd805039b07dba85f70..1e449f375d98ea82636dee7a246a3fe6af57b2b6 100644 (file)
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -206,7 +206,23 @@ static int soc_widget_write(struct snd_soc_dapm_widget *w, int reg, int val)
        return -1;
 }
 
-static int soc_widget_update_bits(struct snd_soc_dapm_widget *w,
+static inline void soc_widget_lock(struct snd_soc_dapm_widget *w)
+{
+       if (w->codec)
+               mutex_lock(&w->codec->mutex);
+       else if (w->platform)
+               mutex_lock(&w->platform->mutex);
+}
+
+static inline void soc_widget_unlock(struct snd_soc_dapm_widget *w)
+{
+       if (w->codec)
+               mutex_unlock(&w->codec->mutex);
+       else if (w->platform)
+               mutex_unlock(&w->platform->mutex);
+}
+
+static int soc_widget_update_bits_locked(struct snd_soc_dapm_widget *w,
        unsigned short reg, unsigned int mask, unsigned int value)
 {
        bool change;
@@ -219,18 +235,24 @@ static int soc_widget_update_bits(struct snd_soc_dapm_widget *w,
                if (ret != 0)
                        return ret;
        } else {
+               soc_widget_lock(w);
                ret = soc_widget_read(w, reg);
-               if (ret < 0)
+               if (ret < 0) {
+                       soc_widget_unlock(w);
                        return ret;
+               }
 
                old = ret;
                new = (old & ~mask) | (value & mask);
                change = old != new;
                if (change) {
                        ret = soc_widget_write(w, reg, new);
-                       if (ret < 0)
+                       if (ret < 0) {
+                               soc_widget_unlock(w);
                                return ret;
+                       }
                }
+               soc_widget_unlock(w);
        }
 
        return change;
@@ -847,7 +869,7 @@ int dapm_reg_event(struct snd_soc_dapm_widget *w,
        else
                val = w->off_val;
 
-       soc_widget_update_bits(w, -(w->reg + 1),
+       soc_widget_update_bits_locked(w, -(w->reg + 1),
                            w->mask << w->shift, val << w->shift);
 
        return 0;
@@ -1105,7 +1127,7 @@ static void dapm_seq_run_coalesced(struct snd_soc_dapm_context *dapm,
                        "pop test : Applying 0x%x/0x%x to %x in %dms\n",
                        value, mask, reg, card->pop_time);
                pop_wait(card->pop_time);
-               soc_widget_update_bits(w, reg, mask, value);
+               soc_widget_update_bits_locked(w, reg, mask, value);
        }
 
        list_for_each_entry(w, pending, power_list) {
@@ -1235,7 +1257,7 @@ static void dapm_widget_update(struct snd_soc_dapm_context *dapm)
                               w->name, ret);
        }
 
-       ret = snd_soc_update_bits(w->codec, update->reg, update->mask,
+       ret = soc_widget_update_bits_locked(w, update->reg, update->mask,
                                  update->val);
        if (ret < 0)
                pr_err("%s DAPM update failed: %d\n", w->name, ret);