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@xxxxxxxxx>
Reviewed-by: Rui Miguel Silva <rmfrfs@xxxxxxxxx>
---
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);
