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qed: Fix reading wrong value in loop condition

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[ Upstream commit ed4eac20dc ]

The value of "sb_index" is written by the hardware. Reading its value and
writing it to "index" must finish before checking the loop condition.

Signed-off-by: Denis Bolotin <denis.bolotin@cavium.com>
Signed-off-by: Michal Kalderon <michal.kalderon@cavium.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
2018-11-12 12:50:23 +02:00
committed by Chris
parent 370144ad86
commit fa2490d06c
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/qlogic/qed/qed_int.c
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@@ -2135,6 +2135,8 @@ static int qed_int_attentions(struct qed_hwfn *p_hwfn)
*/
do {
index = p_sb_attn->sb_index;
/* finish reading index before the loop condition */
dma_rmb();
attn_bits = le32_to_cpu(p_sb_attn->atten_bits);
attn_acks = le32_to_cpu(p_sb_attn->atten_ack);
} while (index != p_sb_attn->sb_index);