From 2394d99fcee6228f73dd6ecf5b7222024075d0aa Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 10 Jan 2012 22:20:12 -0500
Subject: [PATCH] autofs4: autofs4_wait() vs. autofs4_catatonic_mode() race

commit 4041bcdc7bef06a2fb29c57394c713a74bd13b08 upstream.

We need to recheck ->catatonic after autofs4_wait() got ->wq_mutex
for good, or we might end up with wq inserted into queue after
autofs4_catatonic_mode() had done its thing.  It will stick there
forever, since there won't be anything to clear its ->name.name.

A bit of a complication: validate_request() drops and regains ->wq_mutex.
It actually ends up the most convenient place to stick the check into...

Acked-by: Ian Kent <raven@themaw.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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