On Wed, Apr 27, 2016 at 04:51:37PM +0530, Vaishali Thakkar wrote:
> Here, a location is reset to NULL before being passed to PTR_ERR.
> So, PTR_ERR should be called before its argument is reassigned
> to NULL. Further to simplify things use PTR_ERR_OR_ZERO instead
> of PTR_ERR and IS_ERR.
>
> Problem found using Coccinelle.
>
> Signed-off-by: Vaishali Thakkar <vaishali.thak...@oracle.com>
> ---
> drivers/gpu/drm/msm/edp/edp_ctrl.c | 16 +++++++++-------
> 1 file changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/edp/edp_ctrl.c
> b/drivers/gpu/drm/msm/edp/edp_ctrl.c
> index 81200e9..7816541 100644
> --- a/drivers/gpu/drm/msm/edp/edp_ctrl.c
> +++ b/drivers/gpu/drm/msm/edp/edp_ctrl.c
> @@ -302,21 +302,23 @@ static void edp_clk_disable(struct edp_ctrl *ctrl, u32
> clk_mask)
> static int edp_regulator_init(struct edp_ctrl *ctrl)
> {
> struct device *dev = &ctrl->pdev->dev;
> + int ret;
>
> DBG("");
> ctrl->vdda_vreg = devm_regulator_get(dev, "vdda");
> - if (IS_ERR(ctrl->vdda_vreg)) {
> + ret = PTR_ERR_OR_ZERO(ctrl->vdda_vreg);
> + if (ret) {
> pr_err("%s: Could not get vdda reg, ret = %ld\n", __func__,
> - PTR_ERR(ctrl->vdda_vreg));
> + ret);
> ctrl->vdda_vreg = NULL;
> - return PTR_ERR(ctrl->vdda_vreg);
> + return ret;
> }
> ctrl->lvl_vreg = devm_regulator_get(dev, "lvl-vdd");
> - if (IS_ERR(ctrl->lvl_vreg)) {
> - pr_err("Could not get lvl-vdd reg, %ld",
> - PTR_ERR(ctrl->lvl_vreg));
> + ret = PTR_ERR_OR_ZERO(ctrl->lvl_vreg);
> + if (ret) {
While you're rewriting them, it might be worth making these two pr_err()
print the same format, e.g.:
pr_err("%s: Could not get lvl-vdd reg, ret = %ld\n", __func__, ret);
> + pr_err("Could not get lvl-vdd reg, %ld", ret);
> ctrl->lvl_vreg = NULL;
> - return PTR_ERR(ctrl->lvl_vreg);
> + return ret;
> }
>
> return 0;
> --
> 2.1.4
Reviewed-by: Eric Engestrom <eric.engest...@imgtec.com>
