From: Philipp Reisner <philipp.reisner@linbit.com>
Date: Mon, 10 Nov 2014 16:21:14 +0000 (+0100)
Subject: drbd: Fix state change in case of connection timeout
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~91^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9581f97a687724ea41cf2e145dda4751161198c1;p=pandora-kernel.git

drbd: Fix state change in case of connection timeout

A connection timeout affects all volumes of a resource!
Under the following conditions:

 A resource with multiple volumes
  AND
 ko-count >=1
  AND
 a write request triggers the timeout (ko-count * timeout)

DRBD's internal state gets confused. That in turn may
lead to very miss leading follow up failures. E.g.
"BUG: scheduling while atomic"

CC: stable@kernel.org # v3.17
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
---

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