1 files changed, 21 insertions, 5 deletions

diff --git a/sound/oss/sh_dac_audio.c b/sound/oss/sh_dac_audio.c
index 4153752507e3..479e3025a8a3 100644
--- a/sound/oss/sh_dac_audio.c
+++ b/sound/oss/sh_dac_audio.c
@@ -16,6 +16,7 @@
 #include <linux/slab.h>
 #include <linux/fs.h>
 #include <linux/sound.h>
+#include <linux/smp_lock.h>
 #include <linux/soundcard.h>
 #include <linux/interrupt.h>
 #include <linux/hrtimer.h>
@@ -92,7 +93,7 @@ static void dac_audio_set_rate(void)
         wakeups_per_second = ktime_set(0, 1000000000 / rate);
 }
 
-static int dac_audio_ioctl(struct inode *inode, struct file *file,
+static int dac_audio_ioctl(struct file *file,
                            unsigned int cmd, unsigned long arg)
 {
         int val;
@@ -158,6 +159,17 @@ static int dac_audio_ioctl(struct inode *inode, struct file *file,
         return -EINVAL;
 }
 
+static long dac_audio_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
+{
+        int ret;
+
+        lock_kernel();
+        ret = dac_audio_ioctl(file, cmd, arg);
+        unlock_kernel();
+
+        return ret;
+}
+
 static ssize_t dac_audio_write(struct file *file, const char *buf, size_t count,
                                loff_t * ppos)
 {
@@ -216,13 +228,17 @@ static int dac_audio_open(struct inode *inode, struct file *file)
 {
         if (file->f_mode & FMODE_READ)
                 return -ENODEV;
-        if (in_use)
+
+        lock_kernel();
+        if (in_use) {
+                unlock_kernel();
                 return -EBUSY;
+        }
 
         in_use = 1;
 
         dac_audio_start();
-
+        unlock_kernel();
         return 0;
 }
 
@@ -237,8 +253,8 @@ static int dac_audio_release(struct inode *inode, struct file *file)
 
 const struct file_operations dac_audio_fops = {
       .read =           dac_audio_read,
-      .write =  dac_audio_write,
-      .ioctl =  dac_audio_ioctl,
+      .write =          dac_audio_write,
+      .unlocked_ioctl = dac_audio_unlocked_ioctl,
       .open =           dac_audio_open,
       .release =        dac_audio_release,
 };