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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>
This commit is contained in:
Jonathan Corbet 2008-05-18 15:39:11 -06:00
parent f2b9857eee
commit a30427d92d
1 changed files with 2 additions and 0 deletions
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2
fs/char_dev.c
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@ -373,6 +373,8 @@ static int chrdev_open(struct inode *inode, struct file *filp)
return -ENXIO; return -ENXIO;
new = container_of(kobj, struct cdev, kobj); new = container_of(kobj, struct cdev, kobj);
spin_lock(&cdev_lock); spin_lock(&cdev_lock);
/* Check i_cdev again in case somebody beat us to it while
we dropped the lock. */
p = inode->i_cdev; p = inode->i_cdev;
if (!p) { if (!p) {
inode->i_cdev = p = new; inode->i_cdev = p = new;