usb: ohci-da8xx: ensure error return on variable error is set

Currently when an error occurs when calling devm_gpiod_get_optional or
calling gpiod_to_irq it causes an uninitialized error return in variable
'error' to be returned.  Fix this by ensuring the error variable is set
from da8xx_ohci->oc_gpio and oc_irq.

Thanks to Dan Carpenter for spotting the uninitialized error in the
gpiod_to_irq failure case.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: d193abf1c913 ("usb: ohci-da8xx: add vbus and overcurrent gpios")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Cc: stable <stable@vger.kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20200107123901.101190-1-colin.king@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/ohci-da8xx.c b/drivers/usb/host/ohci-da8xx.c
index 38183ac..1371b0c 100644 (file)
--- a/drivers/usb/host/ohci-da8xx.c
+++ b/drivers/usb/host/ohci-da8xx.c
@@ -415,13 +415,17 @@ static int ohci_da8xx_probe(struct platform_device *pdev)
        }
 
        da8xx_ohci->oc_gpio = devm_gpiod_get_optional(dev, "oc", GPIOD_IN);
-       if (IS_ERR(da8xx_ohci->oc_gpio))
+       if (IS_ERR(da8xx_ohci->oc_gpio)) {
+               error = PTR_ERR(da8xx_ohci->oc_gpio);
                goto err;
+       }
 
        if (da8xx_ohci->oc_gpio) {
                oc_irq = gpiod_to_irq(da8xx_ohci->oc_gpio);
-               if (oc_irq < 0)
+               if (oc_irq < 0) {
+                       error = oc_irq;
                        goto err;
+               }
 
                error = devm_request_threaded_irq(dev, oc_irq, NULL,
                                ohci_da8xx_oc_thread, IRQF_TRIGGER_RISING |