Add a comment in chrdev_open()

I stared at this code for a while and almost deleted it before understanding crept into my slow brain. Hopefully this makes life easier for the next person to happen on it. Signed-off-by: Jonathan Corbet <[email protected]>
nhatuan84 · Jun 20, 2008 · a30427d · a30427d
1 parent f2b9857
commit a30427d
Showing 1 changed file with 2 additions and 0 deletions.
diff --git 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;