usb: gadget: xilinx: fix devm_ioremap_resource() check

devm_ioremap_resource() returns IOMEM_ERR_PTR() and it never
returns NULL, fix the check to prevent access to invalid
virtual address.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Sören Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/udc/udc-xilinx.c b/drivers/usb/gadget/udc/udc-xilinx.c
index dd3e9fd..1f24274 100644 (file)
--- a/drivers/usb/gadget/udc/udc-xilinx.c
+++ b/drivers/usb/gadget/udc/udc-xilinx.c
@@ -2071,8 +2071,8 @@ static int xudc_probe(struct platform_device *pdev)
        /* Map the registers */
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        udc->addr = devm_ioremap_resource(&pdev->dev, res);
-       if (!udc->addr)
-               return -ENOMEM;
+       if (IS_ERR(udc->addr))
+               return PTR_ERR(udc->addr);
 
        irq = platform_get_irq(pdev, 0);
        if (irq < 0) {