linux-kernel - [PATCH] qla3xxx: Ensure request/response queue addr writes to the registers

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Message-ID: <50849604.9050109@oracle.com>
Date:	Mon, 22 Oct 2012 08:40:36 +0800
From:	Joe Jin <joe.jin@...cle.com>
To:	Jitendra Kalsaria <jitendra.kalsaria@...gic.com>,
	Ron Mercer <ron.mercer@...gic.com>,
	Linux Driver <Linux-Driver@...gic.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org,
	Greg Marsden <greg.marsden@...cle.com>
Subject: [PATCH] qla3xxx: Ensure request/response queue addr writes to the
 registers

Before use the request and response queue addr, make sure it has wrote
to the registers.

Signed-off-by: Joe Jin <joe.jin@...cle.com>
Cc: Jitendra Kalsaria <jitendra.kalsaria@...gic.com>
Cc: Ron Mercer <ron.mercer@...gic.com>
---
 drivers/net/ethernet/qlogic/qla3xxx.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c
index df09b1c..6407d0d 100644
--- a/drivers/net/ethernet/qlogic/qla3xxx.c
+++ b/drivers/net/ethernet/qlogic/qla3xxx.c
@@ -2525,6 +2525,13 @@ static int ql_alloc_net_req_rsp_queues(struct ql3_adapter *qdev)
 	qdev->req_q_size =
 	    (u32) (NUM_REQ_Q_ENTRIES * sizeof(struct ob_mac_iocb_req));
 
+	qdev->rsp_q_size = NUM_RSP_Q_ENTRIES * sizeof(struct net_rsp_iocb);
+
+	/* The barrier is required to ensure request and response queue
+	 * addr writes to the registers.
+	 */
+	wmb();
+
 	qdev->req_q_virt_addr =
 	    pci_alloc_consistent(qdev->pdev,
 				 (size_t) qdev->req_q_size,
@@ -2536,8 +2543,6 @@ static int ql_alloc_net_req_rsp_queues(struct ql3_adapter *qdev)
 		return -ENOMEM;
 	}
 
-	qdev->rsp_q_size = NUM_RSP_Q_ENTRIES * sizeof(struct net_rsp_iocb);
-
 	qdev->rsp_q_virt_addr =
 	    pci_alloc_consistent(qdev->pdev,
 				 (size_t) qdev->rsp_q_size,
-- 
1.7.11.7

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