linux-kernel - [PATCH 4.16 117/279] RDMA/mlx5: Properly check return value of mlx5_get_uars

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Date:   Mon, 18 Jun 2018 10:11:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alaa Hleihel <alaa@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        Doug Ledford <dledford@...hat.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.16 117/279] RDMA/mlx5: Properly check return value of mlx5_get_uars_page

4.16-stable review patch.  If anyone has any objections, please let me know.

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

From: Leon Romanovsky <leonro@...lanox.com>

[ Upstream commit 444261ca6ff201fa03de97a5041237e67a9d8d31 ]

Starting from commit 72f36be06138 ("net/mlx5: Fix mlx5_get_uars_page to
return error code") the mlx5_get_uars_page() call returns error in case
of failure, but it was mistakenly overlooked in the merge commit.

Fixes: e7996a9a77fc ("Merge tag v4.15 of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git")
Reported-by: Alaa Hleihel <alaa@...lanox.com>
Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
Signed-off-by: Doug Ledford <dledford@...hat.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/infiniband/hw/mlx5/main.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -4833,9 +4833,7 @@ static void mlx5_ib_stage_cong_debugfs_c
 static int mlx5_ib_stage_uar_init(struct mlx5_ib_dev *dev)
 {
 	dev->mdev->priv.uar = mlx5_get_uars_page(dev->mdev);
-	if (!dev->mdev->priv.uar)
-		return -ENOMEM;
-	return 0;
+	return PTR_ERR_OR_ZERO(dev->mdev->priv.uar);
 }
 
 static void mlx5_ib_stage_uar_cleanup(struct mlx5_ib_dev *dev)