diff options
| author | Denis Bolotin <denis.bolotin@cavium.com> | 2018-11-12 12:50:23 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-13 09:21:35 +0100 |
| commit | 93940a277fdaf2edd308519b89f57a2b6705a9c5 (patch) | |
| tree | 1e044e34093aea70c44b50582f667fa35f178cba /drivers | |
| parent | 30d5a7c1b6c06fad598f5fbd71b513625c462bc5 (diff) | |
qed: Fix reading wrong value in loop condition
[ Upstream commit ed4eac20dcffdad47709422e0cb925981b056668 ]
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/qlogic/qed/qed_int.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/ethernet/qlogic/qed/qed_int.c b/drivers/net/ethernet/qlogic/qed/qed_int.c index 9cc9d62c1fec..8b15a018d625 100644 --- a/drivers/net/ethernet/qlogic/qed/qed_int.c +++ b/drivers/net/ethernet/qlogic/qed/qed_int.c @@ -177,6 +177,8 @@ 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); |