linux-kernel - Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator

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Date:   Thu, 17 Oct 2019 10:46:38 +0100
From:   Rui Miguel Silva <rmfrfs@...il.com>
To:     Chuhong Yuan <hslester96@...il.com>
Cc:     Steve Longerbeam <slongerbeam@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] media: imx7-mipi-csis: Add a check for
 devm_regulator_get

Hi Chuhong,
many thanks for the patch.

On Tue 15 Oct 2019 at 14:59, Chuhong Yuan wrote:
> devm_regulator_get may return an error but mipi_csis_phy_init misses
> a check for it.
> This may lead to problems when regulator_set_voltage uses the unchecked
> pointer.
> This patch adds a check for devm_regulator_get to avoid potential risk.
>
> Signed-off-by: Chuhong Yuan <hslester96@...il.com>

Reviewed-by: Rui Miguel Silva <rmfrfs@...il.com>

---
Cheers,
	Rui

> ---
> Changes in v2:
>   - Add a check in mipi_csis_probe for the modified mipi_csis_phy_init.
>
>  drivers/staging/media/imx/imx7-mipi-csis.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
> index 73d8354e618c..e8a6acaa969e 100644
> --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> @@ -350,6 +350,8 @@ static void mipi_csis_sw_reset(struct csi_state *state)
>  static int mipi_csis_phy_init(struct csi_state *state)
>  {
>  	state->mipi_phy_regulator = devm_regulator_get(state->dev, "phy");
> +	if (IS_ERR(state->mipi_phy_regulator))
> +		return PTR_ERR(state->mipi_phy_regulator);
>
>  	return regulator_set_voltage(state->mipi_phy_regulator, 1000000,
>  				     1000000);
> @@ -966,7 +968,10 @@ static int mipi_csis_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>
> -	mipi_csis_phy_init(state);
> +	ret = mipi_csis_phy_init(state);
> +	if (ret < 0)
> +		return ret;
> +
>  	mipi_csis_phy_reset(state);
>
>  	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);