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usb: host: ehci-sched: refactor scan_isoc function
This patch removes an infinite 'for' loop and makes use of the already existing 'restart' tag instead, reducing one leading tab. The comments and code were corrected conforming file coding style. Tested by compilation only. Caught by checkpatch: WARNING: Too many leading tabs - consider code refactoring Signed-off-by: Geyslan G. Bem <geyslan@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geyslan G. Bem
Greg Kroah-Hartman
parent
93df42ba1b
commit
3f122a997e
@ -2379,9 +2379,11 @@ static int sitd_submit (struct ehci_hcd *ehci, struct urb *urb,
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static void scan_isoc(struct ehci_hcd *ehci)
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{
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unsigned uf, now_frame, frame;
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unsigned fmask = ehci->periodic_size - 1;
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bool modified, live;
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unsigned uf, now_frame, frame;
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unsigned fmask = ehci->periodic_size - 1;
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bool modified, live;
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union ehci_shadow q, *q_p;
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__hc32 type, *hw_p;
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/*
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* When running, scan from last scan point up to "now"
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@ -2399,119 +2401,117 @@ static void scan_isoc(struct ehci_hcd *ehci)
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ehci->now_frame = now_frame;
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frame = ehci->last_iso_frame;
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for (;;) {
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union ehci_shadow q, *q_p;
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__hc32 type, *hw_p;
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restart:
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/* scan each element in frame's queue for completions */
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q_p = &ehci->pshadow [frame];
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hw_p = &ehci->periodic [frame];
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q.ptr = q_p->ptr;
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type = Q_NEXT_TYPE(ehci, *hw_p);
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modified = false;
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/* Scan each element in frame's queue for completions */
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q_p = &ehci->pshadow[frame];
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hw_p = &ehci->periodic[frame];
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q.ptr = q_p->ptr;
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type = Q_NEXT_TYPE(ehci, *hw_p);
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modified = false;
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while (q.ptr != NULL) {
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switch (hc32_to_cpu(ehci, type)) {
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case Q_TYPE_ITD:
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/* If this ITD is still active, leave it for
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* later processing ... check the next entry.
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* No need to check for activity unless the
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* frame is current.
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*/
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if (frame == now_frame && live) {
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rmb();
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for (uf = 0; uf < 8; uf++) {
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if (q.itd->hw_transaction[uf] &
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ITD_ACTIVE(ehci))
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break;
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}
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if (uf < 8) {
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q_p = &q.itd->itd_next;
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hw_p = &q.itd->hw_next;
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type = Q_NEXT_TYPE(ehci,
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q.itd->hw_next);
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q = *q_p;
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while (q.ptr != NULL) {
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switch (hc32_to_cpu(ehci, type)) {
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case Q_TYPE_ITD:
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/*
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* If this ITD is still active, leave it for
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* later processing ... check the next entry.
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* No need to check for activity unless the
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* frame is current.
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*/
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if (frame == now_frame && live) {
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rmb();
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for (uf = 0; uf < 8; uf++) {
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if (q.itd->hw_transaction[uf] &
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ITD_ACTIVE(ehci))
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break;
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}
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}
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/* Take finished ITDs out of the schedule
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* and process them: recycle, maybe report
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* URB completion. HC won't cache the
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* pointer for much longer, if at all.
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*/
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*q_p = q.itd->itd_next;
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if (!ehci->use_dummy_qh ||
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q.itd->hw_next != EHCI_LIST_END(ehci))
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*hw_p = q.itd->hw_next;
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else
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*hw_p = cpu_to_hc32(ehci,
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ehci->dummy->qh_dma);
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type = Q_NEXT_TYPE(ehci, q.itd->hw_next);
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wmb();
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modified = itd_complete (ehci, q.itd);
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q = *q_p;
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break;
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case Q_TYPE_SITD:
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/* If this SITD is still active, leave it for
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* later processing ... check the next entry.
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* No need to check for activity unless the
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* frame is current.
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*/
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if (((frame == now_frame) ||
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(((frame + 1) & fmask) == now_frame))
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&& live
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&& (q.sitd->hw_results &
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SITD_ACTIVE(ehci))) {
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q_p = &q.sitd->sitd_next;
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hw_p = &q.sitd->hw_next;
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if (uf < 8) {
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q_p = &q.itd->itd_next;
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hw_p = &q.itd->hw_next;
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type = Q_NEXT_TYPE(ehci,
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q.sitd->hw_next);
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q.itd->hw_next);
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q = *q_p;
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break;
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}
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}
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/* Take finished SITDs out of the schedule
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* and process them: recycle, maybe report
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* URB completion.
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*/
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*q_p = q.sitd->sitd_next;
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if (!ehci->use_dummy_qh ||
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q.sitd->hw_next != EHCI_LIST_END(ehci))
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*hw_p = q.sitd->hw_next;
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else
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*hw_p = cpu_to_hc32(ehci,
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ehci->dummy->qh_dma);
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/*
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* Take finished ITDs out of the schedule
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* and process them: recycle, maybe report
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* URB completion. HC won't cache the
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* pointer for much longer, if at all.
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*/
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*q_p = q.itd->itd_next;
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if (!ehci->use_dummy_qh ||
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q.itd->hw_next != EHCI_LIST_END(ehci))
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*hw_p = q.itd->hw_next;
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else
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*hw_p = cpu_to_hc32(ehci, ehci->dummy->qh_dma);
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type = Q_NEXT_TYPE(ehci, q.itd->hw_next);
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wmb();
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modified = itd_complete(ehci, q.itd);
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q = *q_p;
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break;
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case Q_TYPE_SITD:
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/*
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* If this SITD is still active, leave it for
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* later processing ... check the next entry.
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* No need to check for activity unless the
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* frame is current.
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*/
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if (((frame == now_frame) ||
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(((frame + 1) & fmask) == now_frame))
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&& live
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&& (q.sitd->hw_results & SITD_ACTIVE(ehci))) {
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q_p = &q.sitd->sitd_next;
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hw_p = &q.sitd->hw_next;
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type = Q_NEXT_TYPE(ehci, q.sitd->hw_next);
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wmb();
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modified = sitd_complete (ehci, q.sitd);
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q = *q_p;
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break;
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default:
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ehci_dbg(ehci, "corrupt type %d frame %d shadow %p\n",
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type, frame, q.ptr);
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// BUG ();
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/* FALL THROUGH */
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case Q_TYPE_QH:
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case Q_TYPE_FSTN:
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/* End of the iTDs and siTDs */
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q.ptr = NULL;
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break;
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}
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/* assume completion callbacks modify the queue */
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if (unlikely(modified && ehci->isoc_count > 0))
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goto restart;
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/*
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* Take finished SITDs out of the schedule
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* and process them: recycle, maybe report
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* URB completion.
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*/
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*q_p = q.sitd->sitd_next;
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if (!ehci->use_dummy_qh ||
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q.sitd->hw_next != EHCI_LIST_END(ehci))
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*hw_p = q.sitd->hw_next;
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else
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*hw_p = cpu_to_hc32(ehci, ehci->dummy->qh_dma);
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type = Q_NEXT_TYPE(ehci, q.sitd->hw_next);
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wmb();
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modified = sitd_complete(ehci, q.sitd);
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q = *q_p;
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break;
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default:
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ehci_dbg(ehci, "corrupt type %d frame %d shadow %p\n",
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type, frame, q.ptr);
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/* BUG(); */
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/* FALL THROUGH */
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case Q_TYPE_QH:
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case Q_TYPE_FSTN:
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/* End of the iTDs and siTDs */
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q.ptr = NULL;
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break;
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}
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/* Stop when we have reached the current frame */
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if (frame == now_frame)
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break;
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/* The last frame may still have active siTDs */
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ehci->last_iso_frame = frame;
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frame = (frame + 1) & fmask;
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/* Assume completion callbacks modify the queue */
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if (unlikely(modified && ehci->isoc_count > 0))
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goto restart;
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}
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/* Stop when we have reached the current frame */
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if (frame == now_frame)
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return;
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/* The last frame may still have active siTDs */
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ehci->last_iso_frame = frame;
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frame = (frame + 1) & fmask;
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goto restart;
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}
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