linux-kernel - [PATCH v2] drm/msm: Move call to PTR_ERR_OR

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <1461849769-16780-1-git-send-email-vaishali.thakkar@oracle.com>
Date:	Thu, 28 Apr 2016 18:52:49 +0530
From:	Vaishali Thakkar <vaishali.thakkar@...cle.com>
To:	airlied@...ux.ie
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	Vaishali Thakkar <vaishali.thakkar@...cle.com>
Subject: [PATCH v2] 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>
Reviewed-by: Eric Engestrom <eric.engestrom@...tec.com>
---
Changes since v1:
	- No functional changes, just make two pr_err() to print
          the same format
---
 drivers/gpu/drm/msm/edp/edp_ctrl.c | 17 ++++++++++-------
 1 file changed, 10 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..e10fa810 100644
--- a/drivers/gpu/drm/msm/edp/edp_ctrl.c
+++ b/drivers/gpu/drm/msm/edp/edp_ctrl.c
@@ -302,21 +302,24 @@ 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("%s: Could not get lvl-vdd reg, ret = %ld\n", __func__,
+				ret);
 		ctrl->lvl_vreg = NULL;
-		return PTR_ERR(ctrl->lvl_vreg);
+		return ret;
 	}
 
 	return 0;
-- 
2.1.4