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-rw-r--r--fs/char_dev.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/char_dev.c b/fs/char_dev.c
index 68e510b..3cb7cda 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -373,6 +373,8 @@ static int chrdev_open(struct inode *inode, struct file *filp)
return -ENXIO;
new = container_of(kobj, struct cdev, kobj);
spin_lock(&cdev_lock);
+ /* Check i_cdev again in case somebody beat us to it while
+ we dropped the lock. */
p = inode->i_cdev;
if (!p) {
inode->i_cdev = p = new;
@@ -392,11 +394,8 @@ static int chrdev_open(struct inode *inode, struct file *filp)
cdev_put(p);
return -ENXIO;
}
- if (filp->f_op->open) {
- lock_kernel();
+ if (filp->f_op->open)
ret = filp->f_op->open(inode,filp);
- unlock_kernel();
- }
if (ret)
cdev_put(p);
return ret;