static int hci_unlink_urb (urb_t * urb)
{
hci_t * hci;
if (!urb) /* just to be sure */
return -EINVAL;
if (!urb->dev || !urb->dev->bus)
return -ENODEV;
hci = (hci_t *) urb->dev->bus->hcpriv;
/* a request to the virtual root hub */
if (usb_pipedevice (urb->pipe) == hci->rh.devnum) {
return rh_unlink_urb (urb);
}
if (!list_empty (&urb->urb_list)) { /* URB active? */
unsigned long flags;
spin_lock_irqsave (&hci->urb_list_lock, flags);
if (SetCancel(hci,urb)) {
//not in active DMA chain
list_del (&urb->urb_list); //remove from probable endpoint queue
list_add (&urb->urb_list, &hci->return_list);
}
spin_unlock_irqrestore (&hci->urb_list_lock, flags);
if (!(urb->transfer_flags & (USB_ASYNC_UNLINK | USB_TIMEOUT_KILLED)) ) {
/* synchron without callback */
WaitForIdle(hci, urb);
}
} else { /* hcd does not own URB but we keep the driver happy anyway */
if (urb->complete && (urb->transfer_flags & USB_ASYNC_UNLINK)) {
// unsigned long flags;
urb->status = -ENOENT;
urb->actual_length = 0;
// spin_lock_irqsave (&hci->urb_list_lock, flags);
urb->complete (urb);
// spin_unlock_irqrestore (&hci->urb_list_lock, flags);
urb->status = 0;
} else {
urb->status = -ENOENT;
}
}
return 0;
}
static int hci_unlink_urb (struct urb * urb)
{
unsigned long flags;
hci_t * hci;
DECLARE_WAITQUEUE (wait, current);
void * comp = NULL;
if (!urb) /* just to be sure */
return -EINVAL;
if (!urb->dev || !urb->dev->bus)
return -ENODEV;
hci = (hci_t *) urb->dev->bus->hcpriv;
/* a request to the virtual root hub */
if (usb_pipedevice (urb->pipe) == hci->rh.devnum) {
return rh_unlink_urb (urb);
}
if (urb_debug)
urb_print (urb, "UNLINK", 1);
spin_lock_irqsave (&usb_urb_lock, flags);
/* HACK: It seems the HID driver sometimes tries to unlink
* URBs which have never been submitted - and hence whose
* urb_list field has never been initialized. This causes
* crashes on unplug */
if ( (urb->urb_list.prev && urb->urb_list.next)
&& !list_empty (&urb->urb_list)) { /* URB active? */
if (urb->transfer_flags & (USB_ASYNC_UNLINK | USB_TIMEOUT_KILLED)) {
/* asynchron with callback */
list_del (&urb->urb_list); /* relink the urb to the del list */
list_add (&urb->urb_list, &hci->del_list);
comp = urb->complete;
urb->complete = NULL;
spin_unlock_irqrestore (&usb_urb_lock, flags);
} else { /* synchron without callback */
add_wait_queue (&hci->waitq, &wait);
set_current_state (TASK_UNINTERRUPTIBLE);
list_del (&urb->urb_list); /* relink the urb to the del list */
list_add (&urb->urb_list, &hci->del_list);
spin_unlock_irqrestore (&usb_urb_lock, flags);
schedule_timeout(HZ/50);
if (!list_empty (&urb->urb_list))
list_del (&urb->urb_list);
urb->complete = comp;
urb->hcpriv = NULL;
remove_wait_queue (&hci->waitq, &wait);
}
} else { /* hcd does not own URB but we keep the driver happy anyway */
spin_unlock_irqrestore (&usb_urb_lock, flags);
if (urb->complete && (urb->transfer_flags & USB_ASYNC_UNLINK)) {
urb->status = -ENOENT;
urb->actual_length = 0;
urb->complete (urb);
urb->status = 0;
} else {
urb->status = -ENOENT;
}
}
return 0;
}
