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@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>

diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
index 7477e58..70b830d 100644 (file)
--- 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);
@@ -956,7 +958,10 @@ 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);
 
        state->regs = devm_platform_ioremap_resource(pdev, 0);