From: Ram Vepa <ram.vepa@qlogic.com>
Date: Fri, 27 May 2011 13:41:55 +0000 (+0000)
Subject: IB/qib: Fix potential deadlock with link down interrupt
X-Git-Tag: v3.1-rc1~314^2^7~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4356d0b64b9be53c507f66c572c1e275b4529239;p=pandora-kernel.git

IB/qib: Fix potential deadlock with link down interrupt

There is a possibility of a deadlock due to the way locks are
acquired and released in qib_set_uevent_bits(). The function
qib_set_uevent_bits() is called in process context and it uses
spin_lock() and spin_unlock().  This same lock is acquired/released
in interrupt context which can lead to a deadlock when running on
the same cpu.

The fix is to replace spin_lock() and spin_unlock() with
spin_lock_irqsave() and spin_unlock_irqrestore() respectively in
qib_set_uevent_bits().

Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
---

Reading git-diff-tree failed