linux-kernel - [PATCH 5.15 168/171] usb: dwc3: xilinx: fix uninitialized return value

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Message-Id: <20220131105235.700071067@linuxfoundation.org>
Date:   Mon, 31 Jan 2022 11:57:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nathan Chancellor <nathan@...nel.org>,
        Robert Hancock <robert.hancock@...ian.com>
Subject: [PATCH 5.15 168/171] usb: dwc3: xilinx: fix uninitialized return value

From: Robert Hancock <robert.hancock@...ian.com>

commit b470947c3672f7eb7c4c271d510383d896831cc2 upstream.

A previous patch to skip part of the initialization when a USB3 PHY was
not present could result in the return value being uninitialized in that
case, causing spurious probe failures. Initialize ret to 0 to avoid this.

Fixes: 9678f3361afc ("usb: dwc3: xilinx: Skip resets and USB3 register settings for USB2.0 mode")
Cc: <stable@...r.kernel.org>
Reviewed-by: Nathan Chancellor <nathan@...nel.org>
Signed-off-by: Robert Hancock <robert.hancock@...ian.com>
Link: https://lore.kernel.org/r/20220127221500.177021-1-robert.hancock@calian.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/dwc3/dwc3-xilinx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/dwc3/dwc3-xilinx.c
+++ b/drivers/usb/dwc3/dwc3-xilinx.c
@@ -99,7 +99,7 @@ static int dwc3_xlnx_init_zynqmp(struct
 	struct device		*dev = priv_data->dev;
 	struct reset_control	*crst, *hibrst, *apbrst;
 	struct phy		*usb3_phy;
-	int			ret;
+	int			ret = 0;
 	u32			reg;
 
 	usb3_phy = devm_phy_optional_get(dev, "usb3-phy");