netdev - Re: [PATCH net-next] phylink: require valid state argument to phylink_validate_mask

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Message-ID: <d89c52a3-8f2b-e8a2-b15b-3b702913787c@seco.com>
Date:   Tue, 25 Oct 2022 14:56:26 -0400
From:   Sean Anderson <sean.anderson@...o.com>
To:     Jakub Kicinski <kuba@...nel.org>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
        linux@...linux.org.uk, andrew@...n.ch, hkallweit1@...il.com,
        rmk+kernel@...linux.org.uk
Subject: Re: [PATCH net-next] phylink: require valid state argument to
 phylink_validate_mask_caps()

On 10/25/22 14:51, Jakub Kicinski wrote:
> state is deferenced earlier in the function, the NULL check
> is pointless. Since we don't have any crash reports presumably
> it's safe to assume state is not NULL.

Yes, I believe this was in place just for a patch which hasn't
been upstreamed.

> Fixes: f392a1846489 ("net: phylink: provide phylink_validate_mask_caps() helper")
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
> CC: linux@...linux.org.uk
> CC: andrew@...n.ch
> CC: hkallweit1@...il.com
> CC: sean.anderson@...o.com
> CC: rmk+kernel@...linux.org.uk
> ---
>  drivers/net/phy/phylink.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index 62106c9e9a9d..88f60e98b760 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -564,7 +564,7 @@ EXPORT_SYMBOL_GPL(phylink_get_capabilities);
>  /**
>   * phylink_validate_mask_caps() - Restrict link modes based on caps
>   * @supported: ethtool bitmask for supported link modes.
> - * @state: an (optional) pointer to a &struct phylink_link_state.
> + * @state: pointer to a &struct phylink_link_state.
>   * @mac_capabilities: bitmask of MAC capabilities
>   *
>   * Calculate the supported link modes based on @mac_capabilities, and restrict
> @@ -585,8 +585,7 @@ void phylink_validate_mask_caps(unsigned long *supported,
>  	phylink_caps_to_linkmodes(mask, caps);
>  
>  	linkmode_and(supported, supported, mask);
> -	if (state)
> -		linkmode_and(state->advertising, state->advertising, mask);
> +	linkmode_and(state->advertising, state->advertising, mask);
>  }
>  EXPORT_SYMBOL_GPL(phylink_validate_mask_caps);
>  

Reviewed-by: Sean Anderson <sean.anderson@...o.com>