From: Pavel Shilovsky <pshilovsky@samba.org>
Date: Thu, 11 Jul 2013 07:17:45 +0000 (+0400)
Subject: CIFS: Fix a deadlock when a file is reopened
X-Git-Tag: v3.11-rc1~19^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=689c3db4d57a73bee6c5ad7797fce7b54d32a87c;p=pandora-kernel.git

CIFS: Fix a deadlock when a file is reopened

If we request reading or writing on a file that needs to be
reopened, it causes the deadlock: we are already holding rw
semaphore for reading and then we try to acquire it for writing
in cifs_relock_file. Fix this by acquiring the semaphore for
reading in cifs_relock_file due to we don't make any changes in
locks and don't need a write access.

CC: <stable@vger.kernel.org>
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
---

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