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From:   Tomeu Vizoso <tomeu.vizoso@collabora.com>
To:     linux-kernel@vger.kernel.org
Cc:     Felipe Balbi <felipe.balbi@linux.intel.com>,
        Heiko Stuebner <heiko@sntech.de>,
        Tomeu Vizoso <tomeu.vizoso@collabora.com>,
        Amelie Delaunay <amelie.delaunay@st.com>,
        Minas Harutyunyan <hminas@synopsys.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-usb@vger.kernel.org
Subject: [PATCH v4] usb: dwc2: dwc2_vbus_supply_init: fix error check
Date:   Mon, 26 Mar 2018 11:00:01 +0200
Message-Id: <20180326090001.57627-1-tomeu.vizoso@collabora.com>
In-Reply-To: <20180322093943.49717-1-tomeu.vizoso@collabora.com>
References: <20180322093943.49717-1-tomeu.vizoso@collabora.com>
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Sender: linux-kernel-owner@vger.kernel.org
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devm_regulator_get_optional returns -ENODEV if the regulator isn't
there, so if that's the case we have to make sure not to leave -ENODEV
in the regulator pointer.

Also, make sure we return 0 in that case, but correctly propagate any
other errors. Also propagate the error from _dwc2_hcd_start.

Fixes: 531ef5ebea96 ("usb: dwc2: add support for host mode external vbus supply")
Cc: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>

---

v2: Only overwrite the error in the pointer after checking it (Heiko
    Stübner <heiko@sntech.de>)
v3: Remove hunks that shouldn't be in this patch
v4: Don't overwrite the error code before returning it (kbuild test
    robot <lkp@intel.com>)
---
 drivers/usb/dwc2/hcd.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 190f95964000..c51b73b3e048 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -358,9 +358,14 @@ static void dwc2_gusbcfg_init(struct dwc2_hsotg *hsotg)
 
 static int dwc2_vbus_supply_init(struct dwc2_hsotg *hsotg)
 {
+	int ret;
+
 	hsotg->vbus_supply = devm_regulator_get_optional(hsotg->dev, "vbus");
-	if (IS_ERR(hsotg->vbus_supply))
-		return 0;
+	if (IS_ERR(hsotg->vbus_supply)) {
+		ret = PTR_ERR(hsotg->vbus_supply);
+		hsotg->vbus_supply = NULL;
+		return ret == -ENODEV ? 0 : ret;
+	}
 
 	return regulator_enable(hsotg->vbus_supply);
 }
@@ -4342,9 +4347,7 @@ static int _dwc2_hcd_start(struct usb_hcd *hcd)
 
 	spin_unlock_irqrestore(&hsotg->lock, flags);
 
-	dwc2_vbus_supply_init(hsotg);
-
-	return 0;
+	return dwc2_vbus_supply_init(hsotg);
 }
 
 /*
-- 
2.14.3