sound: cdev lock_kernel() pushdown

Signed-off-by: Jonathan Corbet <corbet@lwn.net>

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,

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;
 }