linux-kernel - [PATCH 3.16 159/305] net/mlx5: Fix masking of reserved bits in XRCD number

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Message-ID: <lsq.1471110171.530440337@decadent.org.uk>
Date:	Sat, 13 Aug 2016 18:42:51 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "David S. Miller" <davem@...emloft.net>,
	"Saeed Mahameed" <saeedm@...lanox.com>,
	"Majd Dibbiny" <majd@...lanox.com>
Subject: [PATCH 3.16 159/305] net/mlx5: Fix masking of reserved bits in
 XRCD number

3.16.37-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Majd Dibbiny <majd@...lanox.com>

commit 9cd3411c42c5d5ba55d6e745edfe7df53c1ffa41 upstream.

Mask the reserved bits when reading the number of newly
created XRCD.

Fixes: e126ba97dba9 ('mlx5: Add driver for Mellanox Connect-IB adapters')
Signed-off-by: Majd Dibbiny <majd@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/ethernet/mellanox/mlx5/core/qp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/qp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/qp.c
@@ -274,7 +274,7 @@ int mlx5_core_xrcd_alloc(struct mlx5_cor
 	if (out.hdr.status)
 		err = mlx5_cmd_status_to_err(&out.hdr);
 	else
-		*xrcdn = be32_to_cpu(out.xrcdn);
+		*xrcdn = be32_to_cpu(out.xrcdn) & 0xffffff;
 
 	return err;
 }