linux-kernel - [PATCH] phy: qcom-qmp-combo: fix NULL-deref on runtime resume

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Message-Id: <20221026162116.26462-1-johan+linaro@kernel.org>
Date:   Wed, 26 Oct 2022 18:21:16 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>, stable@...r.kernel.org
Subject: [PATCH] phy: qcom-qmp-combo: fix NULL-deref on runtime resume

Commit fc64623637da ("phy: qcom-qmp-combo,usb: add support for separate
PCS_USB region") started treating the PCS_USB registers as potentially
separate from the PCS registers but used the wrong base when no PCS_USB
offset has been provided.

Fix the PCS_USB base used at runtime resume to prevent dereferencing a
NULL pointer on platforms that do not provide a PCS_USB offset (e.g.
SC7180).

Fixes: fc64623637da ("phy: qcom-qmp-combo,usb: add support for separate PCS_USB region")
Cc: stable@...r.kernel.org	# 5.20
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
index f6328434c61e..ad6a0fd7ba8e 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
@@ -2144,7 +2144,7 @@ static void qmp_combo_enable_autonomous_mode(struct qmp_phy *qphy)
 static void qmp_combo_disable_autonomous_mode(struct qmp_phy *qphy)
 {
 	const struct qmp_phy_cfg *cfg = qphy->cfg;
-	void __iomem *pcs_usb = qphy->pcs_usb ?: qphy->pcs_usb;
+	void __iomem *pcs_usb = qphy->pcs_usb ?: qphy->pcs;
 	void __iomem *pcs_misc = qphy->pcs_misc;
 
 	/* Disable i/o clamp_n on resume for normal mode */
-- 
2.37.3