usb: dwc2: fix memory corruption in dwc2 driver

The move from the staging tree to the main tree exposed a
longstanding memory corruption bug in the dwc2 driver. The
reordering of the driver initialization caused the dwc2 driver
to corrupt the initialization data of the sdhci driver on the
Raspberry Pi platform, which made the bug show up.

The error is in calling to_usb_device(hsotg->dev), since ->dev
is not a member of struct usb_device. The easiest fix is to
just remove the offending code, since it is not really needed.

Thanks to Stephen Warren for tracking down the cause of this.

Reported-by: Andre Heider <a.heider@gmail.com>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index f59484d43b355b15b1297f3341c832a0a395ebb3..4d918ed8d343394bcc92cea19e4e025a9f7c7c5c 100644 (file)
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -2565,25 +2565,14 @@ static void _dwc2_hcd_endpoint_reset(struct usb_hcd *hcd,
                                     struct usb_host_endpoint *ep)
 {
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
-       int is_control = usb_endpoint_xfer_control(&ep->desc);
-       int is_out = usb_endpoint_dir_out(&ep->desc);
-       int epnum = usb_endpoint_num(&ep->desc);
-       struct usb_device *udev;
        unsigned long flags;
 
        dev_dbg(hsotg->dev,
                "DWC OTG HCD EP RESET: bEndpointAddress=0x%02x\n",
                ep->desc.bEndpointAddress);
 
-       udev = to_usb_device(hsotg->dev);
-
        spin_lock_irqsave(&hsotg->lock, flags);
-
-       usb_settoggle(udev, epnum, is_out, 0);
-       if (is_control)
-               usb_settoggle(udev, epnum, !is_out, 0);
        dwc2_hcd_endpoint_reset(hsotg, ep);
-
        spin_unlock_irqrestore(&hsotg->lock, flags);
 }