From: Stefan Weinhuber <wein@de.ibm.com>
Date: Wed, 11 Feb 2009 09:37:31 +0000 (+0100)
Subject: [S390] dasd: fix race in dasd timer handling
X-Git-Tag: v2.6.29-rc5~36^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=48cae885d5a896030588978f503c73c5ed5e62b1;p=pandora-kernel.git

[S390] dasd: fix race in dasd timer handling

In dasd_device_set_timer and dasd_block_set_timer we interpret the
return value of mod_timer in a wrong way. If the timer expires in
the small window between our check of timer_pending and the call to
mod_timer, then the timer will be set, mod_timer returns zero and
we will call add_timer for a timer that is already pending.
As del_timer and mod_timer do all the necessary checking themselves,
we can simplify our code and remove the race a the same time.

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

Reading git-diff-tree failed