From: Sage Weil <sage@inktank.com>
Date: Tue, 31 Jul 2012 01:17:13 +0000 (-0700)
Subject: libceph: avoid dropping con mutex before fault
X-Git-Tag: v3.6-rc1~36^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8636ea672f0c5ab7478c42c5b6705ebd1db7eb6a;p=pandora-kernel.git

libceph: avoid dropping con mutex before fault

The ceph_fault() function takes the con mutex, so we should avoid
dropping it before calling it.  This fixes a potential race with
another thread calling ceph_con_close(), or _open(), or similar (we
don't reverify con->state after retaking the lock).

Add annotation so that lockdep realizes we will drop the mutex before
returning.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
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