linux-kernel - [PATCH] netxen_nic: use spin_[un]lock_bh around tx_clean

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Message-Id: <1430394687-78627-1-git-send-email-tcamuso@redhat.com>
Date:	Thu, 30 Apr 2015 07:51:27 -0400
From:	Tony Camuso <tcamuso@...hat.com>
To:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	manish.chopra@...gic.com, sony.chacko@...gic.com,
	rajesh.borundia@...gic.com, nhorman@...hat.com
Subject: [PATCH] netxen_nic: use spin_[un]lock_bh around tx_clean_lock

While testing this driver with DEBUG_LOCKDEP and DEBUG_SPINLOCK
enabled did not produce any traces, it would be more prudent in the
case of tx_clean_lock to use spin_[un]lock_bh, since this lock is
manipulated in both the process and softirq contexts.

This patch was tested for functionality and regressions with netperf
and DEBUG_LOCKDEP and DEBUG_SPINLOCK enabled.

Signed-off-by: Tony Camuso <tcamuso@...hat.com>

---
 drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
index d746c97..2da9627 100644
--- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
+++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
@@ -137,7 +137,7 @@ void netxen_release_tx_buffers(struct netxen_adapter *adapter)
 	int i, j;
 	struct nx_host_tx_ring *tx_ring = adapter->tx_ring;
 
-	spin_lock(&adapter->tx_clean_lock);
+	spin_lock_bh(&adapter->tx_clean_lock);
 	cmd_buf = tx_ring->cmd_buf_arr;
 	for (i = 0; i < tx_ring->num_desc; i++) {
 		buffrag = cmd_buf->frag_array;
@@ -161,7 +161,7 @@ void netxen_release_tx_buffers(struct netxen_adapter *adapter)
 		}
 		cmd_buf++;
 	}
-	spin_unlock(&adapter->tx_clean_lock);
+	spin_unlock_bh(&adapter->tx_clean_lock);
 }
 
 void netxen_free_sw_resources(struct netxen_adapter *adapter)
-- 
1.8.3.1

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