The driver neglects to check the result of platform_get_irq()'s call and
blithely passes the negative error codes to devm_request_irq() (which takes
*unsigned* IRQ #), causing it to fail with -EINVAL, overriding an original
error code. Stop calling devm_request_irq() with the invalid IRQ #s.

Fixes: 8b2e76687b39 ("USB: AT91 UDC updates, mostly power management")
Signed-off-by: Sergey Shtylyov <redacted>

---
 drivers/usb/gadget/udc/at91_udc.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: usb/drivers/usb/gadget/udc/at91_udc.c
===================================================================

--- usb.orig/drivers/usb/gadget/udc/at91_udc.c
+++ usb/drivers/usb/gadget/udc/at91_udc.c

@@ -1876,7 +1876,9 @@ static int at91udc_probe(struct platform
 	clk_disable(udc->iclk);
 
 	/* request UDC and maybe VBUS irqs */
-	udc->udp_irq = platform_get_irq(pdev, 0);
+	udc->udp_irq = retval = platform_get_irq(pdev, 0);
+	if (retval < 0)
+		goto err_unprepare_iclk;
 	retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0,
 				  driver_name, udc);
 	if (retval) {