linux-kernel - Re: [PATCH 4.19 31/56] net/mlx5: Verify Hardware supports requested ptp function on a given pin

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Date:   Tue, 4 Aug 2020 09:39:06 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Ariel Levkovich <lariel@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 31/56] net/mlx5: Verify Hardware supports requested
 ptp function on a given pin

Hi!

> [ Upstream commit 071995c877a8646209d55ff8edddd2b054e7424c ]
> 
> Fix a bug where driver did not verify Hardware pin capabilities for
> PTP functions.
> 
> Fixes: ee7f12205abc ("net/mlx5e: Implement 1PPS support")
> Signed-off-by: Eran Ben Elisha <eranbe@...lanox.com>
> Reviewed-by: Ariel Levkovich <lariel@...lanox.com>
> Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

> +
>  static int mlx5_ptp_verify(struct ptp_clock_info *ptp, unsigned int pin,
>  			   enum ptp_pin_function func, unsigned int chan)
>  {
> -	return (func == PTP_PF_PHYSYNC) ? -EOPNOTSUPP : 0;
> +	struct mlx5_clock *clock = container_of(ptp, struct mlx5_clock,
> +						ptp_info);
> +
> +	switch (func) {
> +	case PTP_PF_NONE:
> +		return 0;
> +	case PTP_PF_EXTTS:
> +		return !(clock->pps_info.pin_caps[pin] &
> +			 MLX5_MTPPS_REG_CAP_PIN_X_MODE_SUPPORT_PPS_IN);
> +	case PTP_PF_PEROUT:
> +		return !(clock->pps_info.pin_caps[pin] &
> +			 MLX5_MTPPS_REG_CAP_PIN_X_MODE_SUPPORT_PPS_OUT);
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +
> +	return -EOPNOTSUPP;
>  }

The last return statement is unreachable code. I'm not sure if it will
provoke any warnings, but it looks ugly.

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

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index 2d55b7c22c03..a804f92ccf23 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -431,8 +431,6 @@ static int mlx5_ptp_verify(struct ptp_clock_info *ptp, unsigned int pin,
 	default:
 		return -EOPNOTSUPP;
 	}
-
-	return -EOPNOTSUPP;
 }
 
 static const struct ptp_clock_info mlx5_ptp_clock_info = {


-- 
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