linux-kernel - [ 014/127] mac80211: use just spin_lock() in ieee80211_get_tkip

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Date:	Wed,  5 Jun 2013 14:33:01 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Milan Kocian <milon@...cz>,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	Johannes Berg <johannes.berg@...el.com>
Subject: [ 014/127] mac80211: use just spin_lock() in ieee80211_get_tkip_p2k()

3.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johannes Berg <johannes.berg@...el.com>

commit 655914ab863bcc06c84270e4159fd59002d6b529 upstream.

ieee80211_get_tkip_p2k() may be called with interrupts
disabled, so spin_unlock_bh() isn't safe and leads to
warnings. Since it's always called with BHs disabled
already, just use spin_lock().

Reported-by: Milan Kocian <milon@...cz>
Acked-by: Stanislaw Gruszka <sgruszka@...hat.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/mac80211/tkip.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/mac80211/tkip.c
+++ b/net/mac80211/tkip.c
@@ -208,10 +208,10 @@ void ieee80211_get_tkip_p2k(struct ieee8
 	u32 iv32 = get_unaligned_le32(&data[4]);
 	u16 iv16 = data[2] | (data[0] << 8);
 
-	spin_lock_bh(&key->u.tkip.txlock);
+	spin_lock(&key->u.tkip.txlock);
 	ieee80211_compute_tkip_p1k(key, iv32);
 	tkip_mixing_phase2(tk, ctx, iv16, p2k);
-	spin_unlock_bh(&key->u.tkip.txlock);
+	spin_unlock(&key->u.tkip.txlock);
 }
 EXPORT_SYMBOL(ieee80211_get_tkip_p2k);
 


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