linux-kernel - Re: [PATCH next] remoteproc: imx_dsp_rproc: Fix NULL vs IS_ERR() bug in imx_dsp_rproc_add

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Message-ID: <52392a6b-2f9e-45e9-ac18-0b4cb48d0597@nxp.com>
Date: Thu, 27 Nov 2025 09:48:13 +0200
From: Iuliana Prodan <iuliana.prodan@....com>
To: Dan Carpenter <dan.carpenter@...aro.org>, Rob Herring <robh@...nel.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
 Mathieu Poirier <mathieu.poirier@...aro.org>, Shawn Guo
 <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>,
 Geert Uytterhoeven <geert+renesas@...der.be>,
 Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>,
 linux-remoteproc@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 kernel-janitors@...r.kernel.org
Subject: Re: [PATCH next] remoteproc: imx_dsp_rproc: Fix NULL vs IS_ERR() bug
 in imx_dsp_rproc_add_carveout()

On 11/27/2025 9:14 AM, Dan Carpenter wrote:
> The devm_ioremap_resource_wc() function never returns NULL, it returns
> error pointers.  Update the error checking to match.
> 
> Fixes: 67a7bc7f0358 ("remoteproc: Use of_reserved_mem_region_* functions for "memory-region"")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Reviewed-by: Iuliana Prodan <iuliana.prodan@....com>

Thanks,
Iulia
> ---
>   drivers/remoteproc/imx_dsp_rproc.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
> index be83b5f20f15..5130a35214c9 100644
> --- a/drivers/remoteproc/imx_dsp_rproc.c
> +++ b/drivers/remoteproc/imx_dsp_rproc.c
> @@ -710,9 +710,9 @@ static int imx_dsp_rproc_add_carveout(struct imx_dsp_rproc *priv)
>   			return -EINVAL;
>   
>   		cpu_addr = devm_ioremap_resource_wc(dev, &res);
> -		if (!cpu_addr) {
> +		if (IS_ERR(cpu_addr)) {
>   			dev_err(dev, "failed to map memory %pR\n", &res);
> -			return -ENOMEM;
> +			return PTR_ERR(cpu_addr);
>   		}
>   
>   		/* Register memory region */