diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 7cf6a30..66b1f08 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -369,6 +369,7 @@
 	/* -- assigned files -- */
 	struct snd_pcm_file *file;
 	struct file *ffile;
+	void (*pcm_release)(struct snd_pcm_substream *);
 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 	/* -- OSS things -- */
 	struct snd_pcm_oss_substream oss;
@@ -381,13 +382,10 @@
 	struct snd_info_entry *proc_prealloc_entry;
 	/* misc flags */
 	unsigned int no_mmap_ctrl: 1;
+	unsigned int hw_opened: 1;
 };
 
-#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
-#define SUBSTREAM_BUSY(substream) ((substream)->file != NULL || ((substream)->oss.file != NULL))
-#else
 #define SUBSTREAM_BUSY(substream) ((substream)->file != NULL)
-#endif
 
 
 struct snd_pcm_str {
@@ -468,8 +466,12 @@
 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 #endif
 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
-int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct snd_pcm_substream **rsubstream);
+int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
+			   struct snd_pcm_substream **rsubstream);
 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
+int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
+			     struct snd_pcm_substream **rsubstream);
+void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 void snd_pcm_vma_notify_data(void *client, void *data);
 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);