From: Denis Bolotin <dbolotin@marvell.com>
Date: Thu, 3 Jan 2019 12:02:40 +0200
Subject: qed: Fix qed_ll2_post_rx_buffer_notify_fw() by adding a write memory
barrier
Patch-mainline: v5.0-rc3
Git-commit: 46721c3d9e273aea880e9ff835b0e1271e1cd2fb
References: bsc#1104393 FATE#325891 bsc#1104389 FATE#325890
Make sure chain element is updated before ringing the doorbell.
Signed-off-by: Denis Bolotin <dbolotin@marvell.com>
Signed-off-by: Ariel Elior <aelior@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/qlogic/qed/qed_ll2.c | 4 ++++
1 file changed, 4 insertions(+)
--- 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_notif
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));
}