linux-kernel - Re: [PATCH] phy: ocelot-serdes: Fix IS_ERR vs NULL bug in serdes

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Message-ID: <ZyOUr7iDa9nFBxgq@colin-ia-desktop>
Date: Thu, 31 Oct 2024 09:31:11 -0500
From: Colin Foster <colin.foster@...advantage.com>
To: Jinjie Ruan <ruanjinjie@...wei.com>
Cc: vkoul@...nel.org, kishon@...nel.org, linus.walleij@...aro.org,
	treding@...dia.com, florian.fainelli@...adcom.com,
	krzysztof.kozlowski@...aro.org, davem@...emloft.net,
	linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: ocelot-serdes: Fix IS_ERR vs NULL bug in
 serdes_probe()

On Thu, Oct 31, 2024 at 08:38:47PM +0800, Jinjie Ruan wrote:
> dev_get_regmap() return NULL and never return ERR_PTR().
> check NULL to fix it.
> 
> Cc: stable@...r.kernel.org
> Fixes: 672faa7bbf60 ("phy: phy-ocelot-serdes: add ability to be used in a non-syscon configuration")
> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
> ---
>  drivers/phy/mscc/phy-ocelot-serdes.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/phy/mscc/phy-ocelot-serdes.c b/drivers/phy/mscc/phy-ocelot-serdes.c
> index 1cd1b5db2ad7..77ca67ce6e91 100644
> --- a/drivers/phy/mscc/phy-ocelot-serdes.c
> +++ b/drivers/phy/mscc/phy-ocelot-serdes.c
> @@ -512,8 +512,8 @@ static int serdes_probe(struct platform_device *pdev)
>  						    res->name);
>  	}
>  
> -	if (IS_ERR(ctrl->regs))
> -		return PTR_ERR(ctrl->regs);
> +	if (!ctrl->regs)
> +		return -EINVAL;
>  
>  	for (i = 0; i < SERDES_MAX; i++) {
>  		ret = serdes_phy_create(ctrl, i, &ctrl->phys[i]);
> -- 
> 2.34.1
> 

Good find.

Acked-by: colin.foster@...advantage.com
Revieved-by: colin.foster@...advantage.com