On Wed, 15 Dec 2010, Felipe Balbi wrote:
> >+{
> >+ int ret;
> >+ struct usb_bus *bus =
> >+ container_of(work, struct usb_bus, hnp_polling.work);
> >+ struct usb_device *udev = bus->root_hub->children[bus->otg_port - 1];
> >+ u8 *status = kmalloc(sizeof(*status), GFP_KERNEL);
>
> how about:
>
> u8 status;
>
> and...
>
> >+ if (!status)
> >+ return;
> >+
> >+ ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
> >+ USB_REQ_GET_STATUS, USB_DIR_IN | USB_RECIP_DEVICE,
> >+ 0, OTG_STATUS_SELECTOR, status, sizeof(*status),
>
> 0, OTG_STATUS_SELECTOR, &status, sizeof(status);
> ??
You mustn't do DMA to addresses on the stack.
Alan Stern
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