linux-kernel - Re: [PATCH net-next] net: phy: phylink: Handle NULL fwnode

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Date:   Fri, 15 Dec 2017 00:25:06 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: phy: phylink: Handle NULL fwnode_handle

On Thu, Dec 14, 2017 at 03:57:58PM -0800, Florian Fainelli wrote:
> Unlike the various of_* routines to fetch properties, fwnode_* routines can
> have an early check against a NULL fwnode_handle reference which makes them
> return -EINVAL (see fwnode_call_int_op), thus making it virtually impossible to
> differentiate what type of error is going on.
> 
> Have an early check in phylink_register_sfp() so we can keep proceeding with
> the initialization, there is not much we can do without a valid fwnode_handle
> except return early and treat this similarly to -ENOENT.
> 
> Fixes: 8fa7b9b6af25 ("phylink: convert to fwnode")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

Acked-by: Russell King <rmk+kernel@...linux.org.uk>

Thanks Florian.

> ---
>  drivers/net/phy/phylink.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index c89b8c63f16a..69adc0aa141c 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -506,6 +506,9 @@ static int phylink_register_sfp(struct phylink *pl,
>  	struct fwnode_reference_args ref;
>  	int ret;
>  
> +	if (!fwnode)
> +		return 0;
> +
>  	ret = fwnode_property_get_reference_args(fwnode, "sfp", NULL,
>  						 0, 0, &ref);
>  	if (ret < 0) {
> -- 
> 2.14.1
> 

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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