usb: dwc3: fix PHY error handling

PHY layer no longer returns NULL. It will
return -ENXIO when PHY layer isn't enabled
and we can use that to bail out instead of
request a probe deferral.

Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 22 insertions, 2 deletions

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index c845e7087069..e2325adf9c14 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -434,12 +434,32 @@ static int dwc3_probe(struct platform_device *pdev)
                 dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
         }
 
-        if (IS_ERR_OR_NULL(dwc->usb2_phy)) {
+        if (IS_ERR(dwc->usb2_phy)) {
+                ret = PTR_ERR(dwc->usb2_phy);
+
+                /*
+                 * if -ENXIO is returned, it means PHY layer wasn't
+                 * enabled, so it makes no sense to return -EPROBE_DEFER
+                 * in that case, since no PHY driver will ever probe.
+                 */
+                if (ret == -ENXIO)
+                        return ret;
+
                 dev_err(dev, "no usb2 phy configured\n");
                 return -EPROBE_DEFER;
         }
 
-        if (IS_ERR_OR_NULL(dwc->usb3_phy)) {
+        if (IS_ERR(dwc->usb3_phy)) {
+                ret = PTR_ERR(dwc->usb2_phy);
+
+                /*
+                 * if -ENXIO is returned, it means PHY layer wasn't
+                 * enabled, so it makes no sense to return -EPROBE_DEFER
+                 * in that case, since no PHY driver will ever probe.
+                 */
+                if (ret == -ENXIO)
+                        return ret;
+
                 dev_err(dev, "no usb3 phy configured\n");
                 return -EPROBE_DEFER;
         }