1 files changed, 18 insertions, 7 deletions

diff --git a/arch/mips/sibyte/common/sb_tbprof.c b/arch/mips/sibyte/common/sb_tbprof.c
index 63b444eaf01e..28b012ab8dcb 100644
--- a/arch/mips/sibyte/common/sb_tbprof.c
+++ b/arch/mips/sibyte/common/sb_tbprof.c
@@ -28,6 +28,7 @@
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/vmalloc.h>
 #include <linux/fs.h>
 #include <linux/errno.h>
@@ -402,18 +403,26 @@ static int sbprof_zbprof_stop(void)
 static int sbprof_tb_open(struct inode *inode, struct file *filp)
 {
         int minor;
+        int err = 0;
 
+        lock_kernel();
         minor = iminor(inode);
-        if (minor != 0)
-                return -ENODEV;
+        if (minor != 0) {
+                err = -ENODEV;
+                goto out;
+        }
 
-        if (xchg(&sbp.open, SB_OPENING) != SB_CLOSED)
-                return -EBUSY;
+        if (xchg(&sbp.open, SB_OPENING) != SB_CLOSED) {
+                err = -EBUSY;
+                goto out;
+        }
 
         memset(&sbp, 0, sizeof(struct sbprof_tb));
         sbp.sbprof_tbbuf = vmalloc(MAX_TBSAMPLE_BYTES);
-        if (!sbp.sbprof_tbbuf)
-                return -ENOMEM;
+        if (!sbp.sbprof_tbbuf) {
+                err = -ENOMEM;
+                goto out;
+        }
         memset(sbp.sbprof_tbbuf, 0, MAX_TBSAMPLE_BYTES);
         init_waitqueue_head(&sbp.tb_sync);
         init_waitqueue_head(&sbp.tb_read);
@@ -421,7 +430,9 @@ static int sbprof_tb_open(struct inode *inode, struct file *filp)
 
         sbp.open = SB_OPEN;
 
-        return 0;
+  out:
+        unlock_kernel();
+        return err;
 }
 
 static int sbprof_tb_release(struct inode *inode, struct file *filp)