linux-kernel - Re: [PATCH 5.10 49/96] net/mlx5: Fix return value from tracer initialization

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Date:   Tue, 17 Aug 2021 19:51:37 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Aya Levin <ayal@...dia.com>, Moshe Shemesh <moshe@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.10 49/96] net/mlx5: Fix return value from tracer
 initialization

Hi!

> [ Upstream commit bd37c2888ccaa5ceb9895718f6909b247cc372e0 ]
> 
> Check return value of mlx5_fw_tracer_start(), set error path and fix
> return value of mlx5_fw_tracer_init() accordingly.

This is actually two fixes in one: There's cancel_work_sync() added to
the error path, but there's additional error that needs fixing.

Could someone familiar with the code verify it after me?

Best regards,
								Pavel

Signed-off-by: Pavel Machek (CIP) <pavel@...x.de>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
index 3dfcb20e97c6..857be86b4a11 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
@@ -1007,7 +1007,7 @@ int mlx5_fw_tracer_init(struct mlx5_fw_tracer *tracer)
 	err = mlx5_core_alloc_pd(dev, &tracer->buff.pdn);
 	if (err) {
 		mlx5_core_warn(dev, "FWTracer: Failed to allocate PD %d\n", err);
-		return err;
+		goto err_cancel_work;
 	}
 
 	err = mlx5_fw_tracer_create_mkey(tracer);
@@ -1031,6 +1031,7 @@ int mlx5_fw_tracer_init(struct mlx5_fw_tracer *tracer)
 	mlx5_core_destroy_mkey(dev, &tracer->buff.mkey);
 err_dealloc_pd:
 	mlx5_core_dealloc_pd(dev, tracer->buff.pdn);
+err_cancel_work:
 	cancel_work_sync(&tracer->read_fw_strings_work);
 	return err;
 }


> +++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
> @@ -1019,12 +1019,19 @@ int mlx5_fw_tracer_init(struct mlx5_fw_tracer *tracer)
...
>  err_dealloc_pd:
>  	mlx5_core_dealloc_pd(dev, tracer->buff.pdn);
> +	cancel_work_sync(&tracer->read_fw_strings_work);
>  	return err;
>  }
>  

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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