[PATCH AUTOSEL 5.4 151/350] media: imx7-mipi-csis: Add a check for devm_regulator_get

Sasha Levin
2019-12-10T21:30:10Z

From: Chuhong Yuan <hslester96@gmail.com>

[ Upstream commit a0219deefe9ee5006a28d48522f76b217d198c51 ]

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>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/staging/media/imx/imx7-mipi-csis.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
index 73d8354e618c4..e50b1f88e25b5 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