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From:   Fabrice Gasnier <fabrice.gasnier@foss.st.com>
To:     <hminas@synopsys.com>, <gregkh@linuxfoundation.org>,
        <robh+dt@kernel.org>, <krzysztof.kozlowski+dt@linaro.org>,
        <alexandre.torgue@foss.st.com>
CC:     <linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <amelie.delaunay@foss.st.com>, <fabrice.gasnier@foss.st.com>
Subject: [PATCH 1/4] usb: dwc2: improve error handling in __dwc2_lowlevel_hw_enable
Date:   Wed, 12 Apr 2023 17:18:28 +0200
Message-ID: <20230412151831.3069211-2-fabrice.gasnier@foss.st.com>
In-Reply-To: <20230412151831.3069211-1-fabrice.gasnier@foss.st.com>
References: <20230412151831.3069211-1-fabrice.gasnier@foss.st.com>
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Add error handling in __dwc2_lowlevel_hw_enable() that may leave the
clocks and regulators enabled upon error.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
---
 drivers/usb/dwc2/platform.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index d1589ba7d322..c431ce6c119f 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -104,7 +104,7 @@ static int __dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
 	if (hsotg->clk) {
 		ret = clk_prepare_enable(hsotg->clk);
 		if (ret)
-			return ret;
+			goto err_dis_reg;
 	}
 
 	if (hsotg->uphy) {
@@ -113,10 +113,25 @@ static int __dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
 		ret = hsotg->plat->phy_init(pdev, hsotg->plat->phy_type);
 	} else {
 		ret = phy_init(hsotg->phy);
-		if (ret == 0)
+		if (ret == 0) {
 			ret = phy_power_on(hsotg->phy);
+			if (ret)
+				phy_exit(hsotg->phy);
+		}
 	}
 
+	if (ret)
+		goto err_dis_clk;
+
+	return 0;
+
+err_dis_clk:
+	if (hsotg->clk)
+		clk_disable_unprepare(hsotg->clk);
+
+err_dis_reg:
+	regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies);
+
 	return ret;
 }
 
-- 
2.25.1