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Date:   Tue, 17 May 2022 12:40:54 +0300
From:   Heikki Krogerus <heikki.krogerus@linux.intel.com>
To:     Yang Yingliang <yangyingliang@huawei.com>
Cc:     linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
        gregkh@linuxfoundation.org
Subject: Re: [PATCH -next] usb: typec: ucsi: fix return value check in
 ucsi_acpi_probe()
Message-ID: <YoNtppG+XCAP5LW6@kuha.fi.intel.com>
References: <20220516131527.999909-1-yangyingliang@huawei.com>
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In-Reply-To: <20220516131527.999909-1-yangyingliang@huawei.com>
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On Mon, May 16, 2022 at 09:15:27PM +0800, Yang Yingliang wrote:
> If memremap() fails, it never returns NULL. Replace NULL check
> with IS_ERR().

There's already a fix pending for this:
https://patchwork.kernel.org/project/linux-usb/patch/YnjaDBXLmwouCB3M@kili/

thanks,

> Fixes: cdc3d2abf438 ("usb: typec: ucsi: acpi: Map the mailbox with memremap()")
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
> ---
>  drivers/usb/typec/ucsi/ucsi_acpi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi_acpi.c b/drivers/usb/typec/ucsi/ucsi_acpi.c
> index 7455e3aff2be..8873c1644a29 100644
> --- a/drivers/usb/typec/ucsi/ucsi_acpi.c
> +++ b/drivers/usb/typec/ucsi/ucsi_acpi.c
> @@ -133,8 +133,8 @@ static int ucsi_acpi_probe(struct platform_device *pdev)
>  	}
>  
>  	ua->base = devm_memremap(&pdev->dev, res->start, resource_size(res), MEMREMAP_WB);
> -	if (!ua->base)
> -		return -ENOMEM;
> +	if (IS_ERR(ua->base))
> +		return PTR_ERR(ua->base);
>  
>  	ret = guid_parse(UCSI_DSM_UUID, &ua->guid);
>  	if (ret)

-- 
heikki