From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 11 Jan 2012 03:35:38 +0000 (-0500)
Subject: autofs4: deal with autofs4_write/autofs4_write races
X-Git-Tag: v3.3-rc1~106^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d668dc56631da067540b2494d2a1f29ff7b5f15a;p=pandora-kernel.git

autofs4: deal with autofs4_write/autofs4_write races

Just serialize the actual writing of packets into pipe on
a new mutex, independent from everything else in the locking
hierarchy.  As soon as something has started feeding a piece
of packet into the pipe to daemon, we *want* everything else
about to try the same to wait until we are done.

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