/*------------------------------------------------------------------------*
* usb_proc_drain
*
* This function will tear down an USB process, waiting for the
* currently executing command to return.
*
* NOTE: If the structure pointed to by "up" is all zero,
* this function does nothing.
*------------------------------------------------------------------------*/
void
usb_proc_drain(struct usb_process *up)
{
/* check if not initialised */
if (up->up_mtx == NULL)
return;
/* handle special case with Giant */
if (up->up_mtx != &Giant)
mtx_assert(up->up_mtx, MA_NOTOWNED);
mtx_lock(up->up_mtx);
/* Set the gone flag */
up->up_gone = 1;
while (up->up_ptr) {
/* Check if we need to wakeup the USB process */
if (up->up_msleep || up->up_csleep) {
up->up_msleep = 0;
up->up_csleep = 0;
cv_signal(&up->up_cv);
}
/* Check if we are still cold booted */
if (cold) {
#ifndef __rtems__
USB_THREAD_SUSPEND(up->up_ptr);
printf("WARNING: A USB process has "
"been left suspended\n");
break;
#else /* __rtems__ */
BSD_ASSERT(0);
#endif /* __rtems__ */
}
cv_wait(&up->up_cv, up->up_mtx);
}
/* Check if someone is waiting - should not happen */
if (up->up_dsleep) {
up->up_dsleep = 0;
cv_broadcast(&up->up_drain);
DPRINTF("WARNING: Someone is waiting "
"for USB process drain!\n");
}
mtx_unlock(up->up_mtx);
}
/*------------------------------------------------------------------------*
* usb_proc_drain
*
* This function will tear down an USB process, waiting for the
* currently executing command to return.
*
* NOTE: If the structure pointed to by "up" is all zero,
* this function does nothing.
*------------------------------------------------------------------------*/
void
usb_proc_drain(struct usb_process *up)
{
/* check if not initialised */
if (up->up_lock == NULL)
return;
#if 0 /* XXX */
/* handle special case with Giant */
if (up->up_mtx != &Giant)
mtx_assert(up->up_mtx, MA_NOTOWNED);
#else
KKASSERT(!lockowned(up->up_lock));
lockmgr(up->up_lock, LK_EXCLUSIVE);
#endif
/* Set the gone flag */
up->up_gone = 1;
while (up->up_ptr) {
/* Check if we need to wakeup the USB process */
if (up->up_msleep || up->up_csleep) {
up->up_msleep = 0;
up->up_csleep = 0;
cv_signal(&up->up_cv);
}
/* Check if we are still cold booted */
if (cold) {
USB_THREAD_SUSPEND(up->up_ptr);
kprintf("WARNING: A USB process has "
"been left suspended\n");
break;
}
cv_wait(&up->up_cv, up->up_lock);
}
/* Check if someone is waiting - should not happen */
if (up->up_dsleep) {
up->up_dsleep = 0;
cv_broadcast(&up->up_drain);
DPRINTF("WARNING: Someone is waiting "
"for USB process drain!\n");
}
lockmgr(up->up_lock, LK_RELEASE);
}
