diff options
| -rw-r--r-- | drivers/usb/host/ehci-sched.c | 202 |
1 files changed, 101 insertions, 101 deletions
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c index c1704a57e803..74c2023763ad 100644 --- a/drivers/usb/host/ehci-sched.c +++ b/drivers/usb/host/ehci-sched.c @@ -2379,9 +2379,11 @@ static int sitd_submit (struct ehci_hcd *ehci, struct urb *urb, static void scan_isoc(struct ehci_hcd *ehci) { - unsigned uf, now_frame, frame; - unsigned fmask = ehci->periodic_size - 1; - bool modified, live; + unsigned uf, now_frame, frame; + unsigned fmask = ehci->periodic_size - 1; + bool modified, live; + union ehci_shadow q, *q_p; + __hc32 type, *hw_p; /* * When running, scan from last scan point up to "now" @@ -2399,119 +2401,117 @@ static void scan_isoc(struct ehci_hcd *ehci) ehci->now_frame = now_frame; frame = ehci->last_iso_frame; - for (;;) { - union ehci_shadow q, *q_p; - __hc32 type, *hw_p; restart: - /* scan each element in frame's queue for completions */ - q_p = &ehci->pshadow [frame]; - hw_p = &ehci->periodic [frame]; - q.ptr = q_p->ptr; - type = Q_NEXT_TYPE(ehci, *hw_p); - modified = false; - - while (q.ptr != NULL) { - switch (hc32_to_cpu(ehci, type)) { - case Q_TYPE_ITD: - /* If this ITD is still active, leave it for - * later processing ... check the next entry. - * No need to check for activity unless the - * frame is current. - */ - if (frame == now_frame && live) { - rmb(); - for (uf = 0; uf < 8; uf++) { - if (q.itd->hw_transaction[uf] & - ITD_ACTIVE(ehci)) - break; - } - if (uf < 8) { - q_p = &q.itd->itd_next; - hw_p = &q.itd->hw_next; - type = Q_NEXT_TYPE(ehci, - q.itd->hw_next); - q = *q_p; + /* Scan each element in frame's queue for completions */ + q_p = &ehci->pshadow[frame]; + hw_p = &ehci->periodic[frame]; + q.ptr = q_p->ptr; + type = Q_NEXT_TYPE(ehci, *hw_p); + modified = false; + + while (q.ptr != NULL) { + switch (hc32_to_cpu(ehci, type)) { + case Q_TYPE_ITD: + /* + * If this ITD is still active, leave it for + * later processing ... check the next entry. + * No need to check for activity unless the + * frame is current. + */ + if (frame == now_frame && live) { + rmb(); + for (uf = 0; uf < 8; uf++) { + if (q.itd->hw_transaction[uf] & + ITD_ACTIVE(ehci)) break; - } } - - /* Take finished ITDs out of the schedule - * and process them: recycle, maybe report - * URB completion. HC won't cache the - * pointer for much longer, if at all. - */ - *q_p = q.itd->itd_next; - if (!ehci->use_dummy_qh || - q.itd->hw_next != EHCI_LIST_END(ehci)) - *hw_p = q.itd->hw_next; - else - *hw_p = cpu_to_hc32(ehci, - ehci->dummy->qh_dma); - type = Q_NEXT_TYPE(ehci, q.itd->hw_next); - wmb(); - modified = itd_complete (ehci, q.itd); - q = *q_p; - break; - case Q_TYPE_SITD: - /* If this SITD is still active, leave it for - * later processing ... check the next entry. - * No need to check for activity unless the - * frame is current. - */ - if (((frame == now_frame) || - (((frame + 1) & fmask) == now_frame)) - && live - && (q.sitd->hw_results & - SITD_ACTIVE(ehci))) { - - q_p = &q.sitd->sitd_next; - hw_p = &q.sitd->hw_next; + if (uf < 8) { + q_p = &q.itd->itd_next; + hw_p = &q.itd->hw_next; type = Q_NEXT_TYPE(ehci, - q.sitd->hw_next); + q.itd->hw_next); q = *q_p; break; } + } + + /* + * Take finished ITDs out of the schedule + * and process them: recycle, maybe report + * URB completion. HC won't cache the + * pointer for much longer, if at all. + */ + *q_p = q.itd->itd_next; + if (!ehci->use_dummy_qh || + q.itd->hw_next != EHCI_LIST_END(ehci)) + *hw_p = q.itd->hw_next; + else + *hw_p = cpu_to_hc32(ehci, ehci->dummy->qh_dma); + type = Q_NEXT_TYPE(ehci, q.itd->hw_next); + wmb(); + modified = itd_complete(ehci, q.itd); + q = *q_p; + break; + case Q_TYPE_SITD: + /* + * If this SITD is still active, leave it for + * later processing ... check the next entry. + * No need to check for activity unless the + * frame is current. + */ + if (((frame == now_frame) || + (((frame + 1) & fmask) == now_frame)) + && live + && (q.sitd->hw_results & SITD_ACTIVE(ehci))) { - /* Take finished SITDs out of the schedule - * and process them: recycle, maybe report - * URB completion. - */ - *q_p = q.sitd->sitd_next; - if (!ehci->use_dummy_qh || - q.sitd->hw_next != EHCI_LIST_END(ehci)) - *hw_p = q.sitd->hw_next; - else - *hw_p = cpu_to_hc32(ehci, - ehci->dummy->qh_dma); + q_p = &q.sitd->sitd_next; + hw_p = &q.sitd->hw_next; type = Q_NEXT_TYPE(ehci, q.sitd->hw_next); - wmb(); - modified = sitd_complete (ehci, q.sitd); q = *q_p; break; - default: - ehci_dbg(ehci, "corrupt type %d frame %d shadow %p\n", - type, frame, q.ptr); - // BUG (); - /* FALL THROUGH */ - case Q_TYPE_QH: - case Q_TYPE_FSTN: - /* End of the iTDs and siTDs */ - q.ptr = NULL; - break; } - /* assume completion callbacks modify the queue */ - if (unlikely(modified && ehci->isoc_count > 0)) - goto restart; - } - - /* Stop when we have reached the current frame */ - if (frame == now_frame) + /* + * Take finished SITDs out of the schedule + * and process them: recycle, maybe report + * URB completion. + */ + *q_p = q.sitd->sitd_next; + if (!ehci->use_dummy_qh || + q.sitd->hw_next != EHCI_LIST_END(ehci)) + *hw_p = q.sitd->hw_next; + else + *hw_p = cpu_to_hc32(ehci, ehci->dummy->qh_dma); + type = Q_NEXT_TYPE(ehci, q.sitd->hw_next); + wmb(); + modified = sitd_complete(ehci, q.sitd); + q = *q_p; break; + default: + ehci_dbg(ehci, "corrupt type %d frame %d shadow %p\n", + type, frame, q.ptr); + /* BUG(); */ + /* FALL THROUGH */ + case Q_TYPE_QH: + case Q_TYPE_FSTN: + /* End of the iTDs and siTDs */ + q.ptr = NULL; + break; + } - /* The last frame may still have active siTDs */ - ehci->last_iso_frame = frame; - frame = (frame + 1) & fmask; + /* Assume completion callbacks modify the queue */ + if (unlikely(modified && ehci->isoc_count > 0)) + goto restart; } + + /* Stop when we have reached the current frame */ + if (frame == now_frame) + return; + + /* The last frame may still have active siTDs */ + ehci->last_iso_frame = frame; + frame = (frame + 1) & fmask; + + goto restart; } |