1 files changed, 17 insertions, 9 deletions

diff --git a/sound/oss/au1550_ac97.c b/sound/oss/au1550_ac97.c
index c1070e33b32f..fb913e568de1 100644
--- a/sound/oss/au1550_ac97.c
+++ b/sound/oss/au1550_ac97.c
@@ -43,6 +43,7 @@
 #include <linux/sound.h>
 #include <linux/slab.h>
 #include <linux/soundcard.h>
+#include <linux/smp_lock.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
@@ -807,7 +808,9 @@ au1550_llseek(struct file *file, loff_t offset, int origin)
 static int
 au1550_open_mixdev(struct inode *inode, struct file *file)
 {
+        lock_kernel();
         file->private_data = &au1550_state;
+        unlock_kernel();
         return 0;
 }
 
@@ -1797,21 +1800,22 @@ au1550_open(struct inode *inode, struct file *file)
 #endif
 
         file->private_data = s;
+        lock_kernel();
         /* wait for device to become free */
         mutex_lock(&s->open_mutex);
         while (s->open_mode & file->f_mode) {
-                if (file->f_flags & O_NONBLOCK) {
-                        mutex_unlock(&s->open_mutex);
-                        return -EBUSY;
-                }
+                ret = -EBUSY;
+                if (file->f_flags & O_NONBLOCK)
+                        goto out;
                 add_wait_queue(&s->open_wait, &wait);
                 __set_current_state(TASK_INTERRUPTIBLE);
                 mutex_unlock(&s->open_mutex);
                 schedule();
                 remove_wait_queue(&s->open_wait, &wait);
                 set_current_state(TASK_RUNNING);
+                ret = -ERESTARTSYS;
                 if (signal_pending(current))
-                        return -ERESTARTSYS;
+                        goto out2;
                 mutex_lock(&s->open_mutex);
         }
 
@@ -1840,17 +1844,21 @@ au1550_open(struct inode *inode, struct file *file)
 
         if (file->f_mode & FMODE_READ) {
                 if ((ret = prog_dmabuf_adc(s)))
-                        return ret;
+                        goto out;
         }
         if (file->f_mode & FMODE_WRITE) {
                 if ((ret = prog_dmabuf_dac(s)))
-                        return ret;
+                        goto out;
         }
 
         s->open_mode |= file->f_mode & (FMODE_READ | FMODE_WRITE);
-        mutex_unlock(&s->open_mutex);
         mutex_init(&s->sem);
-        return 0;
+        ret = 0;
+out:
+        mutex_unlock(&s->open_mutex);
+out2:
+        unlock_kernel();
+        return ret;
 }
 
 static int