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From: Rui Miguel Silva <rmfrfs@gmail.com>
To: Chuhong Yuan <hslester96@gmail.com>
Cc: devel@driverdev.osuosl.org, Fabio Estevam <festevam@gmail.com>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	linux-kernel@vger.kernel.org, NXP Linux Team <linux-imx@nxp.com>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	Steve Longerbeam <slongerbeam@gmail.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Shawn Guo <shawnguo@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-media@vger.kernel.org
Subject: Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
Date: Thu, 17 Oct 2019 10:46:38 +0100	[thread overview]
Message-ID: <m3zhhzr9fl.fsf@gmail.com> (raw)
In-Reply-To: <20191015135915.6530-1-hslester96@gmail.com>

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@gmail.com>

Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.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);

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WARNING: multiple messages have this Message-ID (diff)
From: Rui Miguel Silva <rmfrfs@gmail.com>
To: Chuhong Yuan <hslester96@gmail.com>
Cc: Steve Longerbeam <slongerbeam@gmail.com>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	NXP Linux Team <linux-imx@nxp.com>,
	linux-media@vger.kernel.org, devel@driverdev.osuosl.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
Date: Thu, 17 Oct 2019 10:46:38 +0100	[thread overview]
Message-ID: <m3zhhzr9fl.fsf@gmail.com> (raw)
In-Reply-To: <20191015135915.6530-1-hslester96@gmail.com>

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@gmail.com>

Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.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);

  parent reply	other threads:[~2019-10-17  9:46 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-15 13:59 [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get Chuhong Yuan
2019-10-15 13:59 ` Chuhong Yuan
2019-10-16  9:06 ` Marco Felsch
2019-10-16  9:06   ` Marco Felsch
2019-10-16 13:43   ` Rui Miguel Silva
2019-10-16 13:43     ` Rui Miguel Silva
2019-10-17  8:10     ` Marco Felsch
2019-10-17  8:10       ` Marco Felsch
2019-10-17  9:43       ` Rui Miguel Silva
2019-10-17  9:43         ` Rui Miguel Silva
2019-10-17  9:46 ` Rui Miguel Silva [this message]
2019-10-17  9:46   ` Rui Miguel Silva

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