linux-kernel - RE: [PATCH] remoteproc: imx_rproc: Check return value of regmap_attach_dev() in imx_rproc_mmio_detect

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Message-ID:
 <PAXPR04MB8459ABF483274720F6BB23188866A@PAXPR04MB8459.eurprd04.prod.outlook.com>
Date: Fri, 6 Feb 2026 03:34:41 +0000
From: Peng Fan <peng.fan@....com>
To: Chen Ni <nichen@...as.ac.cn>, "andersson@...nel.org"
	<andersson@...nel.org>, "mathieu.poirier@...aro.org"
	<mathieu.poirier@...aro.org>, Frank Li <frank.li@....com>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>, "kernel@...gutronix.de"
	<kernel@...gutronix.de>, "festevam@...il.com" <festevam@...il.com>
CC: "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] remoteproc: imx_rproc: Check return value of
 regmap_attach_dev() in imx_rproc_mmio_detect_mode()

> Subject: [PATCH] remoteproc: imx_rproc: Check return value of
> regmap_attach_dev() in imx_rproc_mmio_detect_mode()
> 
> Add error checking for regmap_attach_dev() call in
> imx_rproc_mmio_detect_mode() function to ensure proper error
> propagation.
> 
> Return the value of regmap_attach_dev() if it fails to prevent
> proceeding with an incomplete regmap setup.
> 
> Signed-off-by: Chen Ni <nichen@...as.ac.cn>
> ---
>  drivers/remoteproc/imx_rproc.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/imx_rproc.c
> b/drivers/remoteproc/imx_rproc.c index f5f916d67905..0e23f519c247
> 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -1007,7 +1007,9 @@ static int
> imx_rproc_mmio_detect_mode(struct rproc *rproc)
>  	}
> 
>  	priv->regmap = regmap;
> -	regmap_attach_dev(dev, regmap, &config);
> +	ret = regmap_attach_dev(dev, regmap, &config);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "regmap attach
> failed\n");


In the main probe, there is already dev_err_probe for
detect_mode. So I would use below style as other error
return in imx_rproc_mmio_detect_mode():
dev_err("regmap attach failed\n");
return ret;

Let's wait Mathieu's view.

Regards
Peng.

> 
>  	if (priv->gpr) {
>  		ret = regmap_read(priv->gpr, dcfg->gpr_reg, &val);
> --
> 2.25.1
>