tree 137d7dea836f16f4efc3c709981dee3d306aa757
parent cbd9c883696da72b2b1f03f909dbacc04bbf8b58
author Tejun Heo <htejun@gmail.com> 1200452774 +0900
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1200506043 -0800

sysfs: make sysfs_lookup() return ERR_PTR(-ENOENT) on failed lookup

sysfs tries to keep dcache a strict subset of sysfs_dirent tree by
shooting down dentries when a node is removed, that is, no negative
dentry for sysfs.  However, the lookup function returned NULL and thus
created negative dentries when the target node didn't exist.

Make sysfs_lookup() return ERR_PTR(-ENOENT) on lookup failure.  This
fixes the NULL dereference bug in sysfs_get_dentry() discovered by
bluetooth rfcomm device moving around.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>