linux-kernel - Re: [PATCH v2] phy: ocelot-serdes: Fix IS_ERR() vs NULL bug in serdes

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Message-ID: <ee6521c6-9038-ab16-0773-c9425aae54fd@huawei.com>
Date: Thu, 7 Nov 2024 09:27:48 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: <vkoul@...nel.org>, <kishon@...nel.org>, <krzysztof.kozlowski@...aro.org>,
	<florian.fainelli@...adcom.com>, <colin.foster@...advantage.com>,
	<davem@...emloft.net>, <linux-phy@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] phy: ocelot-serdes: Fix IS_ERR() vs NULL bug in
 serdes_probe()

Gentle ping.

On 2024/11/1 14:11, Jinjie Ruan wrote:
> dev_get_regmap() call can return a null pointer. It will not return
> error pointers. Thus apply a null pointer check instead.
> 
> Cc: stable@...r.kernel.org
> Fixes: 672faa7bbf60 ("phy: phy-ocelot-serdes: add ability to be used in a non-syscon configuration")
> Acked-by: Colin Foster <colin.foster@...advantage.com>
> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
> ---
> v2:
> - Add Acked-by.
> - Update the commit message as Markus suggested.
> ---
>  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]);