linux-kernel - [PATCH 4.0 017/105] net: dp83640: fix improper double spin locking.

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Message-Id: <20150619203558.716367362@linuxfoundation.org>
Date:	Fri, 19 Jun 2015 13:35:07 -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, Richard Cochran <richardcochran@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.0 017/105] net: dp83640: fix improper double spin locking.

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

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

From: Richard Cochran <richardcochran@...il.com>

[ Upstream commit adbe088f6f8b0b7701fe07f51fe6f2bd602a6665 ]

A pair of nested spin locks was introduced in commit 63502b8d0
"dp83640: Fix receive timestamp race condition".

Unfortunately the 'flags' parameter was reused for the inner lock,
clobbering the originally saved IRQ state.  This patch fixes the issue
by changing the inner lock to plain spin_lock without irqsave.

Signed-off-by: Richard Cochran <richardcochran@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/phy/dp83640.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/phy/dp83640.c
+++ b/drivers/net/phy/dp83640.c
@@ -845,7 +845,7 @@ static void decode_rxts(struct dp83640_p
 	list_del_init(&rxts->list);
 	phy2rxts(phy_rxts, rxts);
 
-	spin_lock_irqsave(&dp83640->rx_queue.lock, flags);
+	spin_lock(&dp83640->rx_queue.lock);
 	skb_queue_walk(&dp83640->rx_queue, skb) {
 		struct dp83640_skb_info *skb_info;
 
@@ -860,7 +860,7 @@ static void decode_rxts(struct dp83640_p
 			break;
 		}
 	}
-	spin_unlock_irqrestore(&dp83640->rx_queue.lock, flags);
+	spin_unlock(&dp83640->rx_queue.lock);
 
 	if (!shhwtstamps)
 		list_add_tail(&rxts->list, &dp83640->rxts);


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