From: Jeff Layton <jlayton@redhat.com>
Date: Wed, 25 Jul 2012 18:59:54 +0000 (-0400)
Subject: cifs: ensure that we always do cifsFileInfo_get under the spinlock
X-Git-Tag: v3.6-rc1~85^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=764a1b1acecedfe204cb2e80d8e2cc7c6df1b0b8;p=pandora-kernel.git

cifs: ensure that we always do cifsFileInfo_get under the spinlock

The readpages bug is a regression that was introduced in 6993f74a5.
This also fixes a couple of similar bugs in the uncached read and write
codepaths.

Also, prevent this sort of thing in the future by having cifsFileInfo_get
take the spinlock itself, and adding a _locked variant for use in places
that are already holding the lock. The _put code has always done that
so this makes for a less confusing interface.

Cc: <stable@vger.kernel.org> # 3.5.x
Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
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