netdev - [PATCH] net: cassini: use nested lock annotation

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Date:	Fri,  9 May 2014 01:07:17 +0200
From:	Emil Goode <emilgoode@...il.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Jingoo Han <jg1.han@...sung.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Arend van Spriel <arend@...adcom.com>,
	Joe Perches <joe@...ches.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, Emil Goode <emilgoode@...il.com>
Subject: [PATCH] net: cassini: use nested lock annotation

In the cas_lock_tx function we acquire multiple locks in a loop and
need to use nested lock annotation to prevent lockdep warnings.

Reported-by: Meelis Roos <mroos@...ux.ee>
Signed-off-by: Emil Goode <emilgoode@...il.com>
---
 drivers/net/ethernet/sun/cassini.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sun/cassini.c b/drivers/net/ethernet/sun/cassini.c
index df8d383..b9ac20f 100644
--- a/drivers/net/ethernet/sun/cassini.c
+++ b/drivers/net/ethernet/sun/cassini.c
@@ -246,7 +246,7 @@ static inline void cas_lock_tx(struct cas *cp)
 	int i;
 
 	for (i = 0; i < N_TX_RINGS; i++)
-		spin_lock(&cp->tx_lock[i]);
+		spin_lock_nested(&cp->tx_lock[i], i);
 }
 
 static inline void cas_lock_all(struct cas *cp)
-- 
1.7.10.4

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