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 <corbet@lwn.net>

parent f2b9857e

fs/char_dev.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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;