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qed: Fix qed_ll2_post_rx_buffer_notify_fw() by adding a write memory barrier

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[ Upstream commit 46721c3d9e ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Denis Bolotin
2019-01-03 12:02:40 +02:00
committed by Greg Kroah-Hartman
parent 1fa0cf450c
commit 08eb17ec3c
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/qlogic/qed/qed_ll2.c
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@@ -1592,6 +1592,10 @@ 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));
}