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

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Date:	Mon, 22 Oct 2012 10:17:14 -0700
From:	Jitendra Kalsaria <jitendra.kalsaria@...gic.com>
To:	Joe Jin <joe.jin@...cle.com>, Ron Mercer <ron.mercer@...gic.com>,
	Dept-Eng Linux Driver <Linux-Driver@...gic.com>,
	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	netdev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Greg Marsden <greg.marsden@...cle.com>
Subject: RE: [PATCH] qla3xxx: Ensure request/response queue addr writes to
 the registers



>From: Joe Jin [mailto:joe.jin@...cle.com] 
>Sent: Sunday, October 21, 2012 5:41 PM
>To: Jitendra Kalsaria; Ron Mercer; Dept-Eng Linux Driver; David Miller; Andrew Morton
>Cc: netdev; linux-kernel; Greg Marsden
>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,

Acked-by: Jitendra Kalsaria <jitendra.kalsaria@...gic.com>

-- 
1.7.11.7



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