sound: cdev lock_kernel() pushdown

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

2 files changed, 19 insertions, 1 deletions

diff --git a/sound/core/sound.c b/sound/core/sound.c
index 812f91b3de5b..65b66fa6f97e 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 46daca175502..dcfc1d5ce631 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;
 }