If platform_get_irq() returns IRQ0 (considered invalid according to Linus)
the driver blithely passes it to usb_add_hcd() that treats IRQ0 as no IRQ
at all. Deny IRQ0 right away, returning -EINVAL from the probe() method...

Fixes: df44831ee2dd ("USB host: Add USB ehci support for nuvoton npcm7xx platform")
Signed-off-by: Sergey Shtylyov <redacted>
---
 drivers/usb/host/ehci-npcm7xx.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/host/ehci-npcm7xx.c b/drivers/usb/host/ehci-npcm7xx.c
index 6b5a7a873e01..aff3d906ced5 100644
--- a/drivers/usb/host/ehci-npcm7xx.c
+++ b/drivers/usb/host/ehci-npcm7xx.c

@@ -114,6 +114,10 @@ static int npcm7xx_ehci_hcd_drv_probe(struct platform_device *pdev)
                retval = irq;
                goto fail;
        }
+       if (!irq) {
+               retval = -EINVAL;
+               goto fail;
+       }

        /*
         * Right now device-tree probed devices don't get dma_mask set.
--

2.26.3