This patch fixes an issue that this driver ignores errors other than
the non-existence of the device, f.e. a memory allocation failure
in devm_phy_get(). So, this patch replaces devm_phy_get() with
devm_phy_optional_get().

Reported-by: Simon Horman <horms+rene...@verge.net.au>
Fixes: 279d4bc64060 ("usb: gadget: udc: renesas_usb3: add support for generic 
phy")
Cc: <sta...@vger.kernel.org> # v4.15+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
---
Remarks:
 - A new file in v2

 drivers/usb/gadget/udc/renesas_usb3.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/udc/renesas_usb3.c 
b/drivers/usb/gadget/udc/renesas_usb3.c
index 233bc04..0e70163 100644
--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -2636,9 +2636,11 @@ static int renesas_usb3_probe(struct platform_device 
*pdev)
         * This is optional. So, if this driver cannot get a phy,
         * this driver will not handle a phy anymore.
         */
-       usb3->phy = devm_phy_get(&pdev->dev, "usb");
-       if (IS_ERR(usb3->phy))
-               usb3->phy = NULL;
+       usb3->phy = devm_phy_optional_get(&pdev->dev, "usb");
+       if (IS_ERR(usb3->phy)) {
+               ret = PTR_ERR(usb3->phy);
+               goto err_add_udc;
+       }
 
        pm_runtime_enable(&pdev->dev);
        ret = usb_add_gadget_udc(&pdev->dev, &usb3->gadget);
-- 
1.9.1

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