usb: host: ohci-at91: fix request of irq for optional gpio

[ Upstream commit 325b9313ec3be56c8e2fe03f977fee19cec75820 ]

atmel,oc-gpio is optional. Request its irq only when atmel,oc is set
in device tree.

devm_gpiod_get_index_optional returns NULL if -ENOENT. Check its
return value for NULL before error, because it is more probable that
atmel,oc is not set.

This fixes the following errors on boards where atmel,oc is not set in
device tree:
[    0.960000] at91_ohci 500000.ohci: failed to request gpio "overcurrent" IRQ
[    0.960000] at91_ohci 500000.ohci: failed to request gpio "overcurrent" IRQ
[    0.970000] at91_ohci 500000.ohci: failed to request gpio "overcurrent" IRQ

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index 5302f988e7e670eec3fbd66f0058a49e91f22b76..e0ebd3d513c688662fa2f43879852a84c6eb9d1d 100644 (file)
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -550,6 +550,8 @@ static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
                pdata->overcurrent_pin[i] =
                        devm_gpiod_get_index_optional(&pdev->dev, "atmel,oc",
                                                      i, GPIOD_IN);
+               if (!pdata->overcurrent_pin[i])
+                       continue;
                if (IS_ERR(pdata->overcurrent_pin[i])) {
                        err = PTR_ERR(pdata->overcurrent_pin[i]);
                        dev_err(&pdev->dev, "unable to claim gpio \"overcurrent\": %d\n", err);