1 files changed, 24 insertions, 9 deletions

diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 88525a958291..6b4b1287b314 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -371,14 +371,17 @@ static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
                                                   struct snd_info_buffer *buffer)
 {
         struct snd_pcm_substream *substream = entry->private_data;
-        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct snd_pcm_runtime *runtime;
+
+        mutex_lock(&substream->pcm->open_mutex);
+        runtime = substream->runtime;
         if (!runtime) {
                 snd_iprintf(buffer, "closed\n");
-                return;
+                goto unlock;
         }
         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
                 snd_iprintf(buffer, "no setup\n");
-                return;
+                goto unlock;
         }
         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
@@ -397,20 +400,25 @@ static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
         }
 #endif
+ unlock:
+        mutex_unlock(&substream->pcm->open_mutex);
 }
 
 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
                                                   struct snd_info_buffer *buffer)
 {
         struct snd_pcm_substream *substream = entry->private_data;
-        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct snd_pcm_runtime *runtime;
+
+        mutex_lock(&substream->pcm->open_mutex);
+        runtime = substream->runtime;
         if (!runtime) {
                 snd_iprintf(buffer, "closed\n");
-                return;
+                goto unlock;
         }
         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
                 snd_iprintf(buffer, "no setup\n");
-                return;
+                goto unlock;
         }
         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
@@ -420,24 +428,29 @@ static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
+ unlock:
+        mutex_unlock(&substream->pcm->open_mutex);
 }
 
 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
                                                struct snd_info_buffer *buffer)
 {
         struct snd_pcm_substream *substream = entry->private_data;
-        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct snd_pcm_runtime *runtime;
         struct snd_pcm_status status;
         int err;
+
+        mutex_lock(&substream->pcm->open_mutex);
+        runtime = substream->runtime;
         if (!runtime) {
                 snd_iprintf(buffer, "closed\n");
-                return;
+                goto unlock;
         }
         memset(&status, 0, sizeof(status));
         err = snd_pcm_status(substream, &status);
         if (err < 0) {
                 snd_iprintf(buffer, "error %d\n", err);
-                return;
+                goto unlock;
         }
         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
@@ -451,6 +464,8 @@ static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
         snd_iprintf(buffer, "-----\n");
         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
+ unlock:
+        mutex_unlock(&substream->pcm->open_mutex);
 }
 
 #ifdef CONFIG_SND_PCM_XRUN_DEBUG