3 files changed, 25 insertions, 3 deletions

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 61f5d42..c49b9d9 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -22,6 +22,7 @@
 #include <linux/mm.h>
 #include <linux/file.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/time.h>
 #include <linux/pm_qos_params.h>
 #include <linux/uio.h>
@@ -3249,14 +3250,17 @@ static int snd_pcm_fasync(int fd, struct file * file, int on)
 	struct snd_pcm_file * pcm_file;
 	struct snd_pcm_substream *substream;
 	struct snd_pcm_runtime *runtime;
-	int err;
+	int err = -ENXIO;
 
+	lock_kernel();
 	pcm_file = file->private_data;
 	substream = pcm_file->substream;
-	snd_assert(substream != NULL, return -ENXIO);
+	snd_assert(substream != NULL, goto out);
 	runtime = substream->runtime;
 
 	err = fasync_helper(fd, file, on, &runtime->fasync);
+out:
+	unlock_kernel();
 	if (err < 0)
 		return err;
 	return 0;
diff --git a/sound/core/sound.c b/sound/core/sound.c
index 6c8ab48..62e057a 100644
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -21,6 +21,7 @@
 
 #include <linux/init.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/time.h>
 #include <linux/device.h>
 #include <linux/moduleparam.h>
@@ -121,7 +122,7 @@ void *snd_lookup_minor_data(unsigned int minor, int type)
 
 EXPORT_SYMBOL(snd_lookup_minor_data);
 
-static int snd_open(struct inode *inode, struct file *file)
+static int __snd_open(struct inode *inode, struct file *file)
 {
 	unsigned int minor = iminor(inode);
 	struct snd_minor *mptr = NULL;
@@ -163,6 +164,18 @@ static int snd_open(struct inode *inode, struct file *file)
 	return err;
 }
 
+
+/* BKL pushdown: nasty #ifdef avoidance wrapper */
+static int snd_open(struct inode *inode, struct file *file)
+{
+	int ret;
+
+	lock_kernel();
+	ret = __snd_open(inode, file);
+	unlock_kernel();
+	return ret;
+}
+
 static const struct file_operations snd_fops =
 {
 	.owner =	THIS_MODULE,
diff --git a/sound/sound_core.c b/sound/sound_core.c
index 46daca1..dcfc1d5 100644
--- a/sound/sound_core.c
+++ b/sound/sound_core.c
@@ -37,6 +37,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/fs.h>
@@ -464,6 +465,8 @@ int soundcore_open(struct inode *inode, struct file *file)
 	struct sound_unit *s;
 	const struct file_operations *new_fops = NULL;
 
+	lock_kernel ();
+
 	chain=unit&0x0F;
 	if(chain==4 || chain==5)	/* dsp/audio/dsp16 */
 	{
@@ -511,9 +514,11 @@ int soundcore_open(struct inode *inode, struct file *file)
 			file->f_op = fops_get(old_fops);
 		}
 		fops_put(old_fops);
+		unlock_kernel();
 		return err;
 	}
 	spin_unlock(&sound_loader_lock);
+	unlock_kernel();
 	return -ENODEV;
 }