linux-kernel - [PATCH 1/2] phy: mediatek: hdmi: mt8195: fix uninitialized variable usage in pll

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Message-Id: <20230413-fixes-for-mt8195-hdmi-phy-v1-1-b8482458df0d@baylibre.com>
Date:   Thu, 13 Apr 2023 14:46:25 +0200
From:   Guillaume Ranquet <granquet@...libre.com>
To:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Guillaume Ranquet <granquet@...libre.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH 1/2] phy: mediatek: hdmi: mt8195: fix uninitialized
 variable usage in pll_calc

The ret variable in mtk_hdmi_pll_calc() was used unitialized as reported
by the kernel test robot.

Fix the issue by removing the variable altogether and testing out the
return value of mtk_hdmi_pll_set_hw()

Fixes: 45810d486bb44 ("phy: mediatek: add support for phy-mtk-hdmi-mt8195")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
---
 drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
index abfc077fb0a8..e10da6c4147e 100644
--- a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
+++ b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
@@ -213,7 +213,7 @@ static int mtk_hdmi_pll_calc(struct mtk_hdmi_phy *hdmi_phy, struct clk_hw *hw,
 	u64 tmds_clk, pixel_clk, da_hdmitx21_ref_ck, ns_hdmipll_ck, pcw;
 	u8 txpredivs[4] = { 2, 4, 6, 12 };
 	u32 fbkdiv_low;
-	int i, ret;
+	int i;
 
 	pixel_clk = rate;
 	tmds_clk = pixel_clk;
@@ -292,10 +292,9 @@ static int mtk_hdmi_pll_calc(struct mtk_hdmi_phy *hdmi_phy, struct clk_hw *hw,
 	if (!(digital_div <= 32 && digital_div >= 1))
 		return -EINVAL;
 
-	mtk_hdmi_pll_set_hw(hw, PLL_PREDIV, fbkdiv_high, fbkdiv_low,
+	if (mtk_hdmi_pll_set_hw(hw, PLL_PREDIV, fbkdiv_high, fbkdiv_low,
 			    PLL_FBKDIV_HS3, posdiv1, posdiv2, txprediv,
-			    txposdiv, digital_div);
-	if (ret)
+			    txposdiv, digital_div))
 		return -EINVAL;
 
 	return 0;

-- 
2.39.2