usb: dwc2: fix kernel oops during driver probe

This patch make sure that all necessary members of dwc2_hsotg
are initialized before the irq handler is requested. So
the kernel oops triggered by dwc2_handle_common_intr has
been fixed.

  dwc2 20980000.usb: Configuration mismatch. Forcing host mode
  dwc2 20980000.usb: no platform data or transceiver defined
  Unable to handle kernel paging request at virtual address cc860040
  pgd = c0004000
  [cc860040] *pgd=0b41e811, *pte=00000000, *ppte=00000000
  Internal error: Oops: 7 [#1] ARM
  CPU: 0 PID: 1 Comm: swapper Not tainted 4.3.0-rc3+ #19
  Hardware name: BCM2835
  task: cb494000 ti: cb4d0000 task.ti: cb4d0000
  PC is at dwc2_is_controller_alive+0x18/0x34
  LR is at dwc2_handle_common_intr+0x24/0xb60

Acked-by: John Youn <johnyoun@synopsys.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 91e2e6b86c7c66884055358babba0986906a7694..39c1cbf0e75d9a5957b1567def5d23fb3631a015 100644 (file)
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -367,20 +367,6 @@ static int dwc2_driver_probe(struct platform_device *dev)
        if (retval)
                return retval;
 
-       irq = platform_get_irq(dev, 0);
-       if (irq < 0) {
-               dev_err(&dev->dev, "missing IRQ resource\n");
-               return irq;
-       }
-
-       dev_dbg(hsotg->dev, "registering common handler for irq%d\n",
-               irq);
-       retval = devm_request_irq(hsotg->dev, irq,
-                                 dwc2_handle_common_intr, IRQF_SHARED,
-                                 dev_name(hsotg->dev), hsotg);
-       if (retval)
-               return retval;
-
        res = platform_get_resource(dev, IORESOURCE_MEM, 0);
        hsotg->regs = devm_ioremap_resource(&dev->dev, res);
        if (IS_ERR(hsotg->regs))
@@ -415,6 +401,20 @@ static int dwc2_driver_probe(struct platform_device *dev)
 
        dwc2_set_all_params(hsotg->core_params, -1);
 
+       irq = platform_get_irq(dev, 0);
+       if (irq < 0) {
+               dev_err(&dev->dev, "missing IRQ resource\n");
+               return irq;
+       }
+
+       dev_dbg(hsotg->dev, "registering common handler for irq%d\n",
+               irq);
+       retval = devm_request_irq(hsotg->dev, irq,
+                                 dwc2_handle_common_intr, IRQF_SHARED,
+                                 dev_name(hsotg->dev), hsotg);
+       if (retval)
+               return retval;
+
        retval = dwc2_lowlevel_hw_enable(hsotg);
        if (retval)
                return retval;