linux-kernel - Re: [PATCH v2] firmware: Fix an NULL vs IS

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Message-ID: <2023071643-anthill-snowdrift-f1f6@gregkh>
Date:   Sun, 16 Jul 2023 07:44:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Wang Ming <machel@...o.com>
Cc:     Dinh Nguyen <dinguyen@...nel.org>, Alan Tull <atull@...nel.org>,
        Richard Gong <richard.gong@...el.com>,
        linux-kernel@...r.kernel.org, opensource.kernel@...o.com
Subject: Re: [PATCH v2] firmware: Fix an NULL vs IS_ERR() bug in probe

On Sun, Jul 16, 2023 at 09:52:57AM +0800, Wang Ming wrote:
> The devm_memremap() function returns error pointers.
> It never returns NULL. Fix the check.
> 
> Fixes: 7ca5ce896524 ("firmware: add Intel Stratix10 service layer driver")
> Signed-off-by: Wang Ming <machel@...o.com>
> ---
>  drivers/firmware/stratix10-svc.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/stratix10-svc.c b/drivers/firmware/stratix10-svc.c
> index 2d674126160f..935bc0cf913f 100644
> --- a/drivers/firmware/stratix10-svc.c
> +++ b/drivers/firmware/stratix10-svc.c
> @@ -756,7 +756,8 @@ svc_create_memory_pool(struct platform_device *pdev,
>  	paddr = begin;
>  	size = end - begin;
>  	va = devm_memremap(dev, paddr, size, MEMREMAP_WC);
> -	if (!va) {
> +
> +	if (IS_ERR(va)) {

Why did you add an extra blank line?