Add a comment in chrdev_open()

[~andy/linux] / fs / char_dev.c

diff --git a/fs/char_dev.c b/fs/char_dev.c
index 68e510b88457e85d8831aa0b48a0479c137d3cb3..a54d69369b2f4d5384f9072e99ee0e015c780e87 100644 (file)
--- 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;