tree e417b4c456ae31dc1dde8027b6be44a1a9f19395
parent fb30d64568fd8f6a21afef987f11852a109723da
author Dipankar Sarma <dipankar@in.ibm.com> 1145424106 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1145463231 -0700

[PATCH] Fix file lookup without ref

There are places in the kernel where we look up files in fd tables and
access the file structure without holding refereces to the file.  So, we
need special care to avoid the race between looking up files in the fd
table and tearing down of the file in another CPU.  Otherwise, one might
see a NULL f_dentry or such torn down version of the file.  This patch
fixes those special places where such a race may happen.

Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Acked-by: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>