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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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