videopix: BKL pushdown

Add explicit lock_kernel() calls to vfc_open().

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

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/sbus/char/vfc_dev.c b/drivers/sbus/char/vfc_dev.c
index d4f8fcded51d..1f6cb8ae2784 100644
--- a/drivers/sbus/char/vfc_dev.c
+++ b/drivers/sbus/char/vfc_dev.c
@@ -24,6 +24,7 @@
 #include <linux/spinlock.h>
 #include <linux/mutex.h>
 #include <linux/mm.h>
+#include <linux/smp_lock.h>
 
 #include <asm/openprom.h>
 #include <asm/oplib.h>
@@ -178,14 +179,17 @@ static int vfc_open(struct inode *inode, struct file *file)
 {
         struct vfc_dev *dev;
 
+        lock_kernel();
         spin_lock(&vfc_dev_lock);
         dev = vfc_get_dev_ptr(iminor(inode));
         if (dev == NULL) {
                 spin_unlock(&vfc_dev_lock);
+                unlock_kernel();
                 return -ENODEV;
         }
         if (dev->busy) {
                 spin_unlock(&vfc_dev_lock);
+                unlock_kernel();
                 return -EBUSY;
         }
 
@@ -202,6 +206,7 @@ static int vfc_open(struct inode *inode, struct file *file)
         vfc_captstat_reset(dev);
         
         vfc_unlock_device(dev);
+        unlock_kernel();
         return 0;
 }