1 files changed, 4 insertions, 0 deletions
diff --git a/fs/fifo.c b/fs/fifo.c
index 25a08e757..ee048ac02 100644
--- a/fs/fifo.c
+++ b/fs/fifo.c
@@ -11,6 +11,7 @@
 
 #include <linux/mm.h>
 #include <linux/malloc.h>
+#include <linux/smp_lock.h>
 
 static void wait_for_partner(struct inode* inode, unsigned int* cnt)
 {
@@ -32,6 +33,7 @@ static int fifo_open(struct inode *inode, struct file *filp)
 	int ret;
 
 	ret = -ERESTARTSYS;
+	lock_kernel();
 	if (down_interruptible(PIPE_SEM(*inode)))
 		goto err_nolock_nocleanup;
 
@@ -114,6 +116,7 @@ static int fifo_open(struct inode *inode, struct file *filp)
 
 	/* Ok! */
 	up(PIPE_SEM(*inode));
+	unlock_kernel();
 	return 0;
 
 err_rd:
@@ -140,6 +143,7 @@ err_nocleanup:
 	up(PIPE_SEM(*inode));
 
 err_nolock_nocleanup:
+	unlock_kernel();
 	return ret;
 }