From 59f01183a7846c1621a23dd88182f5a890f38717 Mon Sep 17 00:00:00 2001
From: Stanislaw Gruszka <sgruszka@redhat.com>
Date: Wed, 19 Feb 2014 09:15:09 +0100
Subject: [PATCH] iwl3945: fix wakeup interrupt

We have only 5 tx queues on 3945, updating il->txq[5] results in
writing random value to HBUS_TARG_WRPTR register.

Additionally use spin lock to protect txq->write_ptr and
txq->need_update fields also modified in TX path.

Tested-by: Pedro Francisco <pedrogfrancisco@gmail.com>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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