[ALSA] Fix mmap_count with O_APPEND opened streams

Move mmap_count to snd_pcm_substream instead of runtime struct
so that multiplly opened substreams via O_APPEND can be handled
correctly.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index cebf0310a8dc..f84d84993a31 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -300,7 +300,6 @@ struct snd_pcm_runtime {
         /* -- mmap -- */
         volatile struct snd_pcm_mmap_status *status;
         volatile struct snd_pcm_mmap_control *control;
-        atomic_t mmap_count;
 
         /* -- locking / scheduling -- */
         wait_queue_head_t sleep;
@@ -369,6 +368,7 @@ struct snd_pcm_substream {
         /* -- assigned files -- */
         void *file;
         int ref_count;
+        atomic_t mmap_count;
         unsigned int f_flags;
         void (*pcm_release)(struct snd_pcm_substream *);
 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
@@ -972,13 +972,13 @@ struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigne
 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
 {
         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
-        atomic_inc(&substream->runtime->mmap_count);
+        atomic_inc(&substream->mmap_count);
 }
 
 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
 {
         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
-        atomic_dec(&substream->runtime->mmap_count);
+        atomic_dec(&substream->mmap_count);
 }
 
 /* mmap for io-memory area */