From: Anton Vorontsov <anton.vorontsov@linaro.org>
Date: Tue, 7 Feb 2012 06:49:39 +0000 (+0400)
Subject: sysrq: Fix possible race with exiting task
X-Git-Tag: v3.4-rc1~185^2~112^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e502babe0a85226f2417b60a8710cf8192879180;p=pandora-kernel.git

sysrq: Fix possible race with exiting task

sysrq should grab the tasklist lock, otherwise calling force_sig() is
not safe, as it might race with exiting task, which ->sighand might be
set to NULL already.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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