linux-kernel - [PATCH] phy: Variable "caldone" in function rockchip_emmc_phy

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Message-Id: <20190206014733.21094-1-yzhai003@ucr.edu>
Date:   Tue,  5 Feb 2019 17:47:33 -0800
From:   Yizhuo <yzhai003@....edu>
To:     unlisted-recipients:; (no To-header on input)
Cc:     csong@...ucr.edu, zhiyunq@...ucr.edu, Yizhuo <yzhai003@....edu>,
        Kishon Vijay Abraham I <kishon@...com>,
        Heiko Stuebner <heiko@...ech.de>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: [PATCH] phy: Variable "caldone" in function rockchip_emmc_phy_power() could be uninitialized

In function rockchip_emmc_phy_power(), local variable "caldone"
could be uninitialized if function regmap_read() returns -EINVAL.
However, it will be used directly in the later context, which
is potentially unsafe.

Signed-off-by: Yizhuo <yzhai003@....edu>
---
 drivers/phy/rockchip/phy-rockchip-emmc.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-emmc.c b/drivers/phy/rockchip/phy-rockchip-emmc.c
index f1b24f18e9b2..ca921ae08309 100644
--- a/drivers/phy/rockchip/phy-rockchip-emmc.c
+++ b/drivers/phy/rockchip/phy-rockchip-emmc.c
@@ -85,11 +85,12 @@ struct rockchip_emmc_phy {
 static int rockchip_emmc_phy_power(struct phy *phy, bool on_off)
 {
 	struct rockchip_emmc_phy *rk_phy = phy_get_drvdata(phy);
-	unsigned int caldone;
+	unsigned int caldone = 0;
 	unsigned int dllrdy;
 	unsigned int freqsel = PHYCTRL_FREQSEL_200M;
 	unsigned long rate;
 	unsigned long timeout;
+	int err;
 
 	/*
 	 * Keep phyctrl_pdb and phyctrl_endll low to allow
@@ -164,9 +165,14 @@ static int rockchip_emmc_phy_power(struct phy *phy, bool on_off)
 	 * wait 5us for calpad busy trimming
 	 */
 	udelay(5);
-	regmap_read(rk_phy->reg_base,
+	err = regmap_read(rk_phy->reg_base,
 		    rk_phy->reg_offset + GRF_EMMCPHY_STATUS,
 		    &caldone);
+	if (err) {
+		pr_err("Failed to read status.\n");
+		return err;
+	}
+
 	caldone = (caldone >> PHYCTRL_CALDONE_SHIFT) & PHYCTRL_CALDONE_MASK;
 	if (caldone != PHYCTRL_CALDONE_DONE) {
 		pr_err("rockchip_emmc_phy_power: caldone timeout.\n");
-- 
2.17.1