diff options
| -rw-r--r-- | drivers/usb/host/ehci-sched.c | 67 |
1 files changed, 44 insertions, 23 deletions
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c index be575e46eac3..b7853c8bac0f 100644 --- a/drivers/usb/host/ehci-sched.c +++ b/drivers/usb/host/ehci-sched.c @@ -1349,18 +1349,27 @@ iso_stream_schedule ( /* when's the last uframe this urb could start? */ max = now + mod; - /* typical case: reuse current schedule. stream is still active, - * and no gaps from host falling behind (irq delays etc) + /* Typical case: reuse current schedule, stream is still active. + * Hopefully there are no gaps from the host falling behind + * (irq delays etc), but if there are we'll take the next + * slot in the schedule, implicitly assuming URB_ISO_ASAP. */ if (likely (!list_empty (&stream->td_list))) { start = stream->next_uframe; if (start < now) start += mod; - if (likely ((start + sched->span) < max)) - goto ready; - /* else fell behind; someday, try to reschedule */ - status = -EL2NSYNC; - goto fail; + + /* Fell behind (by up to twice the slop amount)? */ + if (start >= max - 2 * 8 * SCHEDULE_SLOP) + start += stream->interval * DIV_ROUND_UP( + max - start, stream->interval) - mod; + + /* Tried to schedule too far into the future? */ + if (unlikely((start + sched->span) >= max)) { + status = -EFBIG; + goto fail; + } + goto ready; } /* need to schedule; when's the next (u)frame we could start? @@ -1613,6 +1622,9 @@ itd_complete ( } else if (likely ((t & EHCI_ISOC_ACTIVE) == 0)) { desc->status = 0; desc->actual_length = EHCI_ITD_LENGTH (t); + } else { + /* URB was too late */ + desc->status = -EXDEV; } } @@ -2095,7 +2107,7 @@ done: static void scan_periodic (struct ehci_hcd *ehci) { - unsigned frame, clock, now_uframe, mod; + unsigned now_uframe, frame, clock, clock_frame, mod; unsigned modified; mod = ehci->periodic_size << 3; @@ -2111,6 +2123,7 @@ scan_periodic (struct ehci_hcd *ehci) else clock = now_uframe + mod - 1; clock %= mod; + clock_frame = clock >> 3; for (;;) { union ehci_shadow q, *q_p; @@ -2157,22 +2170,26 @@ restart: 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. */ - rmb (); - for (uf = 0; uf < 8 && live; uf++) { - if (0 == (q.itd->hw_transaction [uf] - & ITD_ACTIVE(ehci))) - continue; - incomplete = true; - q_p = &q.itd->itd_next; - hw_p = &q.itd->hw_next; - type = Q_NEXT_TYPE(ehci, + if (frame == clock_frame && live) { + rmb(); + for (uf = 0; uf < 8; uf++) { + if (q.itd->hw_transaction[uf] & + ITD_ACTIVE(ehci)) + break; + } + if (uf < 8) { + incomplete = true; + q_p = &q.itd->itd_next; + hw_p = &q.itd->hw_next; + type = Q_NEXT_TYPE(ehci, q.itd->hw_next); - q = *q_p; - break; + q = *q_p; + break; + } } - if (uf < 8 && live) - break; /* Take finished ITDs out of the schedule * and process them: recycle, maybe report @@ -2189,9 +2206,12 @@ restart: 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 ((q.sitd->hw_results & SITD_ACTIVE(ehci)) - && live) { + if (frame == clock_frame && live && + (q.sitd->hw_results & + SITD_ACTIVE(ehci))) { incomplete = true; q_p = &q.sitd->sitd_next; hw_p = &q.sitd->hw_next; @@ -2260,6 +2280,7 @@ restart: /* rescan the rest of this frame, then ... */ clock = now; + clock_frame = clock >> 3; } else { now_uframe++; now_uframe %= mod; |