From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Fri, 27 Dec 2013 16:17:25 +0000 (+0100)
Subject: drbd: fix a race stopping the worker thread
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~74^2~54
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a80ca1ae81fc52e304e753f6de4ef248df364f9e;p=pandora-kernel.git

drbd: fix a race stopping the worker thread

We may implicitly call drbd_send() from inside wait_for_work(),
via maybe_send_barrier().

If the "stop" signal was send just before that, drbd_send() would call
flush_signals(), and we would run an unbounded schedule() afterwards.

Fix: check for thread_state == RUNNING before we schedule()

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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