From: Stanislaw Gruszka <sgruszka@redhat.com>
Date: Wed, 8 Jun 2011 13:26:31 +0000 (+0200)
Subject: iwlegacy: fix channel switch locking
X-Git-Tag: v3.0-rc3~13^2~15^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=51e65257142a87fe46a1ce5c35c86c5baf012614;p=pandora-kernel.git

iwlegacy: fix channel switch locking

We use priv->mutex to avoid race conditions between chswitch_done()
and mac_channel_switch(), when marking channel switch in
progress. But chswitch_done() can be called in atomic context
from rx_csa() or with mutex already taken from commit_rxon().

To fix remove mutex from chswitch_done() and use atomic bitops
for marking channel switch pending.

Cc: stable@kernel.org # 2.6.39+
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

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