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Message-Id: <20191015135915.6530-1-hslester96@gmail.com>
Date: Tue, 15 Oct 2019 21:59:15 +0800
From: Chuhong Yuan <hslester96@...il.com>
To: unlisted-recipients:; (no To-header on input)
Cc: Rui Miguel Silva <rmfrfs@...il.com>,
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,
Chuhong Yuan <hslester96@...il.com>
Subject: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
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>
---
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);
--
2.20.1
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