raw: BKL pushdown

Put explicit lock_kernel() calls into raw_open(), even though the existing
locking looks adequate.

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

diff --git a/drivers/char/raw.c b/drivers/char/raw.c
index bbfa0e2..505fcbe 100644 (file)
--- a/drivers/char/raw.c
+++ b/drivers/char/raw.c
@@ -19,6 +19,7 @@
 #include <linux/cdev.h>
 #include <linux/device.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 
@@ -53,6 +54,7 @@ static int raw_open(struct inode *inode, struct file *filp)
                return 0;
        }
 
+       lock_kernel();
        mutex_lock(&raw_mutex);
 
        /*
@@ -79,6 +81,7 @@ static int raw_open(struct inode *inode, struct file *filp)
                        bdev->bd_inode->i_mapping;
        filp->private_data = bdev;
        mutex_unlock(&raw_mutex);
+       unlock_kernel();
        return 0;
 
 out2: