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Date:   Thu, 3 Jan 2019 12:02:40 +0200
From:   Denis Bolotin <dbolotin@...vell.com>
To:     <davem@...emloft.net>, <netdev@...r.kernel.org>
CC:     <aelior@...vell.com>, Denis Bolotin <dbolotin@...vell.com>
Subject: [PATCH net 2/2] qed: Fix qed_ll2_post_rx_buffer_notify_fw() by adding a write memory barrier

Make sure chain element is updated before ringing the doorbell.

Signed-off-by: Denis Bolotin <dbolotin@...vell.com>
Signed-off-by: Ariel Elior <aelior@...vell.com>
---
 drivers/net/ethernet/qlogic/qed/qed_ll2.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_ll2.c b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
index 90afd51..d9237c6 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_ll2.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
@@ -1619,6 +1619,10 @@ static void qed_ll2_post_rx_buffer_notify_fw(struct qed_hwfn *p_hwfn,
 	cq_prod = qed_chain_get_prod_idx(&p_rx->rcq_chain);
 	rx_prod.bd_prod = cpu_to_le16(bd_prod);
 	rx_prod.cqe_prod = cpu_to_le16(cq_prod);
+
+	/* Make sure chain element is updated before ringing the doorbell */
+	dma_wmb();
+
 	DIRECT_REG_WR(p_rx->set_prod_addr, *((u32 *)&rx_prod));
 }
 
-- 
1.8.3.1

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