From: James Bottomley <James.Bottomley@suse.de>
Date: Thu, 27 Jan 2011 21:12:37 +0000 (-0500)
Subject: [SCSI] qla2xxx: Fix race that could hang kthread_stop()
X-Git-Tag: v2.6.38-rc6~32^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=563585ec4bf1319f193c2f51682985bcae400cb4;p=pandora-kernel.git

[SCSI] qla2xxx: Fix race that could hang kthread_stop()

There is a small race window in qla2x00_do_dpc() between
checking for kthread_should_stop() and going to sleep after
setting TASK_INTERRUPTIBLE. If qla2x00_free_device() is called
in this window, kthread_stop will wait forever because there
will be no one to wake up the process.

Fix by making sure we only set TASK_INTERRUPTIBLE before checking
kthread_stop().

Reported-by: Bandan Das <bandan.das@stratus.com>
Acked-by: Madhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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