linux-kernel - [PATCH] drm/msm: Move call to PTR_ERR_OR

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Date:	Wed, 27 Apr 2016 16:51:37 +0530
From:	Vaishali Thakkar <vaishali.thakkar@...cle.com>
To:	airlied@...ux.ie
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Vaishali Thakkar <vaishali.thakkar@...cle.com>
Subject: [PATCH] drm/msm: Move call to PTR_ERR_OR_ZERO after reassignment

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.thakkar@...cle.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) {
+		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