vcs: BKL pushdown

Add explicit BKL to vcs_open().

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

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/char/vc_screen.c b/drivers/char/vc_screen.c
index 83aeedda200c..eebfad2777d2 100644
--- a/drivers/char/vc_screen.c
+++ b/drivers/char/vc_screen.c
@@ -34,6 +34,7 @@
 #include <linux/kbd_kern.h>
 #include <linux/console.h>
 #include <linux/device.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 #include <asm/byteorder.h>
@@ -460,9 +461,13 @@ static int
 vcs_open(struct inode *inode, struct file *filp)
 {
         unsigned int currcons = iminor(inode) & 127;
+        int ret = 0;
+        
+        lock_kernel();
         if(currcons && !vc_cons_allocated(currcons-1))
-                return -ENXIO;
-        return 0;
+                ret = -ENXIO;
+        unlock_kernel();
+        return ret;
 }
 
 static const struct file_operations vcs_fops = {