/* caller must hold ehci->lock */
static int periodic_unlink (struct ehci_hcd *ehci, unsigned frame, void *ptr)
{
union ehci_shadow *prev_p = &ehci->pshadow [frame];
__le32 *hw_p = &ehci->periodic [frame];
union ehci_shadow here = *prev_p;
union ehci_shadow *next_p;
/* find predecessor of "ptr"; hw and shadow lists are in sync */
while (here.ptr && here.ptr != ptr) {
prev_p = periodic_next_shadow (prev_p, Q_NEXT_TYPE (*hw_p));
hw_p = &here.qh->hw_next;
here = *prev_p;
}
/* an interrupt entry (at list end) could have been shared */
if (!here.ptr) {
dbg ("entry %p no longer on frame [%d]", ptr, frame);
return 0;
}
// vdbg ("periodic unlink %p from frame %d", ptr, frame);
/* update hardware list ... HC may still know the old structure, so
* don't change hw_next until it'll have purged its cache
*/
next_p = periodic_next_shadow (&here, Q_NEXT_TYPE (*hw_p));
*hw_p = here.qh->hw_next;
/* unlink from shadow list; HCD won't see old structure again */
*prev_p = *next_p;
next_p->ptr = NULL;
return 1;
}
/* caller must hold ehci->lock */
static void periodic_unlink (struct ehci_hcd *ehci, unsigned frame, void *ptr)
{
union ehci_shadow *prev_p = &ehci->pshadow [frame];
__le32 *hw_p = &ehci->periodic [frame];
union ehci_shadow here = *prev_p;
/* find predecessor of "ptr"; hw and shadow lists are in sync */
while (here.ptr && here.ptr != ptr) {
prev_p = periodic_next_shadow (prev_p, Q_NEXT_TYPE (*hw_p));
hw_p = here.hw_next;
here = *prev_p;
}
/* an interrupt entry (at list end) could have been shared */
if (!here.ptr)
return;
/* update shadow and hardware lists ... the old "next" pointers
* from ptr may still be in use, the caller updates them.
*/
*prev_p = *periodic_next_shadow (&here, Q_NEXT_TYPE (*hw_p));
*hw_p = *here.hw_next;
}
static void periodic_unlink (struct ehci_hcd *ehci, unsigned frame, void *ptr)
{
union ehci_shadow *prev_p = &ehci->pshadow[frame];
__hc32 *hw_p = &ehci->periodic[frame];
union ehci_shadow here = *prev_p;
while (here.ptr && here.ptr != ptr) {
prev_p = periodic_next_shadow(ehci, prev_p,
Q_NEXT_TYPE(ehci, *hw_p));
hw_p = shadow_next_periodic(ehci, &here,
Q_NEXT_TYPE(ehci, *hw_p));
here = *prev_p;
}
if (!here.ptr)
return;
*prev_p = *periodic_next_shadow(ehci, &here,
Q_NEXT_TYPE(ehci, *hw_p));
*hw_p = *shadow_next_periodic(ehci, &here, Q_NEXT_TYPE(ehci, *hw_p));
}
