[ALSA] Fix Oops of PCM OSS emulation

Modules: PCM Midlevel,ALSA<-OSS emulation

Fix Oops of PCM OSS emulation occuring when multiple playback is used.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/pcm.h

@@ -367,7 +367,7 @@ struct snd_pcm_substream {
 	struct snd_pcm_group self_group;	/* fake group for non linked substream (with substream lock inside) */
 	struct snd_pcm_group *group;		/* pointer to current group */
 	/* -- assigned files -- */
-	struct snd_pcm_file *file;
+	void *file;
 	struct file *ffile;
 	void (*pcm_release)(struct snd_pcm_substream *);
 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)

sound/core/oss/pcm_oss.c

@@ -1682,7 +1682,7 @@ static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
 	substream->oss.setup = *setup;
 	if (setup->nonblock)
 		substream->ffile->f_flags |= O_NONBLOCK;
-	else
+	else if (setup->block)
 		substream->ffile->f_flags &= ~O_NONBLOCK;
 	runtime = substream->runtime;
 	runtime->oss.params = 1;
@@ -1757,6 +1757,7 @@ static int snd_pcm_oss_open_file(struct file *file,
 		}
 
 		pcm_oss_file->streams[idx] = substream;
+		substream->file = pcm_oss_file;
 		snd_pcm_oss_init_substream(substream, &setup[idx], minor);
 	}
 	
@@ -1809,7 +1810,7 @@ static int snd_pcm_oss_open(struct inode *inode, struct file *file)
 		err = -EFAULT;
 		goto __error;
 	}
-	memset(setup, 0, sizeof(*setup));
+	memset(setup, 0, sizeof(setup));
 	if (file->f_mode & FMODE_WRITE)
 		snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 					   task_name, &setup[0]);

sound/core/pcm_native.c

@@ -2007,14 +2007,16 @@ static void pcm_release_private(struct snd_pcm_substream *substream)
 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
 {
 	snd_pcm_drop(substream);
-	if (substream->pcm_release)
-		substream->pcm_release(substream);
 	if (substream->hw_opened) {
 		if (substream->ops->hw_free != NULL)
 			substream->ops->hw_free(substream);
 		substream->ops->close(substream);
 		substream->hw_opened = 0;
 	}
+	if (substream->pcm_release) {
+		substream->pcm_release(substream);
+		substream->pcm_release = NULL;
+	}
 	snd_pcm_detach_substream(substream);
 }