[PATCH] UHCI: Move code for cleaning up unlinked URBs
This patch (as681) moves some code for cleaning up after unlinked URBs
out of the general completion pathway into the unlinking pathway.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
index 888938d..64b6c74 100644
--- a/drivers/usb/host/uhci-q.c
+++ b/drivers/usb/host/uhci-q.c
@@ -204,25 +204,49 @@
}
/*
- * When the currently executing URB is dequeued, save its current toggle value
+ * When a queue is stopped and a dequeued URB is given back, adjust
+ * the previous TD link (if the URB isn't first on the queue) or
+ * save its toggle value (if it is first and is currently executing).
*/
-static void uhci_save_toggle(struct uhci_qh *qh, struct urb *urb)
+static void uhci_cleanup_queue(struct uhci_qh *qh,
+ struct urb *urb)
{
- struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
+ struct urb_priv *urbp = urb->hcpriv;
struct uhci_td *td;
+ /* Isochronous pipes don't use toggles and their TD link pointers
+ * get adjusted during uhci_urb_dequeue(). */
+ if (qh->type == USB_ENDPOINT_XFER_ISOC)
+ return;
+
+ /* If the URB isn't first on its queue, adjust the link pointer
+ * of the last TD in the previous URB. The toggle doesn't need
+ * to be saved since this URB can't be executing yet. */
+ if (qh->queue.next != &urbp->node) {
+ struct urb_priv *purbp;
+ struct uhci_td *ptd;
+
+ purbp = list_entry(urbp->node.prev, struct urb_priv, node);
+ WARN_ON(list_empty(&purbp->td_list));
+ ptd = list_entry(purbp->td_list.prev, struct uhci_td,
+ list);
+ td = list_entry(urbp->td_list.prev, struct uhci_td,
+ list);
+ ptd->link = td->link;
+ return;
+ }
+
/* If the QH element pointer is UHCI_PTR_TERM then then currently
* executing URB has already been unlinked, so this one isn't it. */
- if (qh_element(qh) == UHCI_PTR_TERM ||
- qh->queue.next != &urbp->node)
+ if (qh_element(qh) == UHCI_PTR_TERM)
return;
qh->element = UHCI_PTR_TERM;
- /* Only bulk and interrupt pipes have to worry about toggles */
- if (!(qh->type == USB_ENDPOINT_XFER_BULK ||
- qh->type == USB_ENDPOINT_XFER_INT))
+ /* Control pipes have to worry about toggles */
+ if (qh->type == USB_ENDPOINT_XFER_CONTROL)
return;
+ /* Save the next toggle value */
WARN_ON(list_empty(&urbp->td_list));
td = list_entry(urbp->td_list.next, struct uhci_td, list);
qh->needs_fixup = 1;
@@ -1121,21 +1145,6 @@
if (qh->type == USB_ENDPOINT_XFER_ISOC)
uhci_unlink_isochronous_tds(uhci, urb);
- /* If the URB isn't first on its queue, adjust the link pointer
- * of the last TD in the previous URB. */
- else if (qh->queue.next != &urbp->node) {
- struct urb_priv *purbp;
- struct uhci_td *ptd, *ltd;
-
- purbp = list_entry(urbp->node.prev, struct urb_priv, node);
- WARN_ON(list_empty(&purbp->td_list));
- ptd = list_entry(purbp->td_list.prev, struct uhci_td,
- list);
- ltd = list_entry(urbp->td_list.prev, struct uhci_td,
- list);
- ptd->link = ltd->link;
- }
-
/* Take the URB off the QH's queue. If the queue is now empty,
* this is a perfect time for a toggle fixup. */
list_del_init(&urbp->node);
@@ -1237,7 +1246,7 @@
list_for_each_entry(urbp, &qh->queue, node) {
urb = urbp->urb;
if (urb->status != -EINPROGRESS) {
- uhci_save_toggle(qh, urb);
+ uhci_cleanup_queue(qh, urb);
uhci_giveback_urb(uhci, qh, urb, regs);
goto restart;
}