From ed4eac20dcffdad47709422e0cb925981b056668 Mon Sep 17 00:00:00 2001 From: Denis Bolotin Date: Mon, 12 Nov 2018 12:50:23 +0200 Subject: [PATCH] qed: Fix reading wrong value in loop condition 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 Signed-off-by: Michal Kalderon Signed-off-by: David S. Miller --- drivers/net/ethernet/qlogic/qed/qed_int.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/ethernet/qlogic/qed/qed_int.c b/drivers/net/ethernet/qlogic/qed/qed_int.c index 0f0aba7..b22f464 100644 --- a/drivers/net/ethernet/qlogic/qed/qed_int.c +++ b/drivers/net/ethernet/qlogic/qed/qed_int.c @@ -992,6 +992,8 @@ 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); -- 2.7.4