linux-kernel - [RFC PATCH V0 05/10] media: mtk-mdp3: remove unnecessary Null check

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Date:   Wed, 23 Jun 2021 15:35:44 +0800
From:   Moudy Ho <moudy.ho@...iatek.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Jernej Skrabec <jernej.skrabec@...l.net>
CC:     Maoguang Meng <maoguang.meng@...iatek.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        daoyuan huang <daoyuan.huang@...iatek.com>,
        Ping-Hsun Wu <ping-hsun.wu@...iatek.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Landley <rob@...dley.net>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <tfiga@...omium.org>,
        <drinkcat@...omium.org>, <acourbot@...omium.org>,
        <pihsun@...omium.org>, <menghui.lin@...iatek.com>,
        <sj.huang@...iatek.com>, <ben.lok@...iatek.com>,
        <randy.wu@...iatek.com>, <moudy.ho@...iatek.com>,
        <srv_heupstream@...iatek.com>, <frederic.chen@...iatek.com>
Subject: [RFC PATCH V0 05/10] media: mtk-mdp3: remove unnecessary Null check

From: daoyuan huang <daoyuan.huang@...iatek.com>

Remove logically unnecessary NULL check in call back function.

Due to no NULL callback param should occur in normal case;
and if we use NULL check to jump over this clock off step,
the clock ref. count may go asymmetric.

Signed-off-by: daoyuan huang <daoyuan.huang@...iatek.com>
---
 drivers/media/platform/mtk-mdp3/mtk-mdp3-cmdq.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/media/platform/mtk-mdp3/mtk-mdp3-cmdq.c b/drivers/media/platform/mtk-mdp3/mtk-mdp3-cmdq.c
index 42a51061677a..df956ca3685c 100644
--- a/drivers/media/platform/mtk-mdp3/mtk-mdp3-cmdq.c
+++ b/drivers/media/platform/mtk-mdp3/mtk-mdp3-cmdq.c
@@ -349,13 +349,8 @@ static void mdp_auto_release_work(struct work_struct *work)
 				auto_release_work);
 	mdp = cb_param->mdp;
 
-	if (cb_param->comps && cb_param->num_comps) {
-		int i;
-
-		for (i = 0; i < cb_param->num_comps; i++)
-			mdp_comp_clock_off(&mdp->pdev->dev,
-					   &cb_param->comps[i]);
-	}
+	mdp_comp_clocks_off(&mdp->pdev->dev, cb_param->comps,
+			    cb_param->num_comps);
 
 	kfree(cb_param->comps);
 	kfree(cb_param);
-- 
2.18.0