linux-kernel - [PATCH 5.19 033/158] net/mlx5: Fix cmd error logging for manage pages cmd

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Date:   Mon, 29 Aug 2022 12:58:03 +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, Roy Novich <royno@...dia.com>,
        Moshe Shemesh <moshe@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 033/158] net/mlx5: Fix cmd error logging for manage pages cmd

From: Roy Novich <royno@...dia.com>

[ Upstream commit 090f3e4f4089ab8041ed7d632c7851c2a42fcc10 ]

When the driver unloads, give/reclaim_pages may fail as PF driver in
teardown flow, current code will lead to the following kernel log print
'failed reclaiming pages: err 0'.

Fix it to get same behavior as before the cited commits,
by calling mlx5_cmd_check before handling error state.
mlx5_cmd_check will verify if the returned error is an actual error
needed to be handled by the driver or not and will return an
appropriate value.

Fixes: 8d564292a166 ("net/mlx5: Remove redundant error on reclaim pages")
Fixes: 4dac2f10ada0 ("net/mlx5: Remove redundant notify fail on give pages")
Signed-off-by: Roy Novich <royno@...dia.com>
Reviewed-by: Moshe Shemesh <moshe@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c b/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c
index ec76a8b1acc1c..60596357bfc7a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c
@@ -376,8 +376,8 @@ static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
 			goto out_dropped;
 		}
 	}
+	err = mlx5_cmd_check(dev, err, in, out);
 	if (err) {
-		err = mlx5_cmd_check(dev, err, in, out);
 		mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
 			       func_id, npages, err);
 		goto out_dropped;
@@ -524,10 +524,13 @@ static int reclaim_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
 		dev->priv.reclaim_pages_discard += npages;
 	}
 	/* if triggered by FW event and failed by FW then ignore */
-	if (event && err == -EREMOTEIO)
+	if (event && err == -EREMOTEIO) {
 		err = 0;
+		goto out_free;
+	}
+
+	err = mlx5_cmd_check(dev, err, in, out);
 	if (err) {
-		err = mlx5_cmd_check(dev, err, in, out);
 		mlx5_core_err(dev, "failed reclaiming pages: err %d\n", err);
 		goto out_free;
 	}
-- 
2.35.1