[PATCH] usb: core: improve handling of hubs with no ports

[Heiner Kallweit]

I get the "hub doesn't have any ports" error message on a system with
Amlogic S905W SoC. Seems the SoC has internal USB 3.0 supports but
is crippled with regard to USB 3.0 ports.
Maybe we shouldn't consider this scenario an error. So let's change
the message to info level, but otherwise keep the handling of the
scenario as it is today. With the patch it looks like this on my
system.

dwc2 c9100000.usb: supply vusb_d not found, using dummy regulator
dwc2 c9100000.usb: supply vusb_a not found, using dummy regulator
dwc2 c9100000.usb: EPs: 7, dedicated fifos, 712 entries in SPRAM
xhci-hcd xhci-hcd.0.auto: xHCI Host Controller
xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 1
xhci-hcd xhci-hcd.0.auto: hcc params 0x0228f664 hci version 0x100 quirks 0x0000000002010010
xhci-hcd xhci-hcd.0.auto: irq 49, io mem 0xc9000000
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
xhci-hcd xhci-hcd.0.auto: xHCI Host Controller
xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 2
xhci-hcd xhci-hcd.0.auto: Host supports USB 3.0 SuperSpeed
usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.
hub 2-0:1.0: USB hub found
hub 2-0:1.0: hub has no ports, exiting

Signed-off-by: Heiner Kallweit <hkallweit1 at gmail.com>
---
 drivers/usb/core/hub.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 83b5aff25..e3f40d1f4 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1423,9 +1423,8 @@ static int hub_configure(struct usb_hub *hub,
 		ret = -ENODEV;
 		goto fail;
 	} else if (hub->descriptor->bNbrPorts == 0) {
-		message = "hub doesn't have any ports!";
-		ret = -ENODEV;
-		goto fail;
+		dev_info(hub_dev, "hub has no ports, exiting\n");
+		return -ENODEV;
 	}
 
 	/*
-- 
2.35.1