Subject: [PATCH] qla3xxx: Ensure request/response queue addr writes to the registers

From: Joe Jin <[email-masked]>
Date: Fri, 19 Oct 2012 09:22:29 +0800

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

Signed-off-by: Joe Jin <[email-masked]>
Cc: Jitendra Kalsaria <[email-masked]>
Cc: Ron Mercer <[email-masked]>
---
 drivers/net/ethernet/qlogic/qla3xxx.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c
index df09b1c..f745ade 100644
--- a/drivers/net/ethernet/qlogic/qla3xxx.c
+++ b/drivers/net/ethernet/qlogic/qla3xxx.c
@@ -2525,6 +2525,12 @@ 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));
 
+	/*
+	 * 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,
-- 
1.7.11.7