diff options
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 8 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-sched.c | 21 |
2 files changed, 19 insertions, 10 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 2e704fa3ced..34a928d3b7d 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -79,7 +79,13 @@ static const char hcd_name [] = "ehci_hcd"; #define EHCI_TUNE_RL_TT 0 #define EHCI_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */ #define EHCI_TUNE_MULT_TT 1 -#define EHCI_TUNE_FLS 2 /* (small) 256 frame schedule */ +/* + * Some drivers think it's safe to schedule isochronous transfers more than + * 256 ms into the future (partly as a result of an old bug in the scheduling + * code). In an attempt to avoid trouble, we will use a minimum scheduling + * length of 512 frames instead of 256. + */ +#define EHCI_TUNE_FLS 1 /* (medium) 512-frame schedule */ #define EHCI_IAA_MSECS 10 /* arbitrary */ #define EHCI_IO_JIFFIES (HZ/10) /* io watchdog > irq_thresh */ diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c index 27dd841b9aa..dd37350170b 100644 --- a/drivers/usb/host/ehci-sched.c +++ b/drivers/usb/host/ehci-sched.c @@ -1395,28 +1395,31 @@ iso_stream_schedule ( struct ehci_iso_stream *stream ) { - u32 now, next, start, period; + u32 now, next, start, period, span; int status; unsigned mod = ehci->periodic_size << 3; struct ehci_iso_sched *sched = urb->hcpriv; - if (sched->span > (mod - SCHEDULE_SLOP)) { + period = urb->interval; + span = sched->span; + if (!stream->highspeed) { + period <<= 3; + span <<= 3; + } + + if (span > mod - SCHEDULE_SLOP) { ehci_dbg (ehci, "iso request %p too long\n", urb); status = -EFBIG; goto fail; } - if ((stream->depth + sched->span) > mod) { + if (stream->depth + span > mod) { ehci_dbg (ehci, "request %p would overflow (%d+%d>%d)\n", - urb, stream->depth, sched->span, mod); + urb, stream->depth, span, mod); status = -EFBIG; goto fail; } - period = urb->interval; - if (!stream->highspeed) - period <<= 3; - now = ehci_readl(ehci, &ehci->regs->frame_index) & (mod - 1); /* Typical case: reuse current schedule, stream is still active. @@ -1445,7 +1448,7 @@ iso_stream_schedule ( period); /* Tried to schedule too far into the future? */ - if (unlikely(((start - now) & (mod - 1)) + sched->span + if (unlikely(((start - now) & (mod - 1)) + span >= mod - 2 * SCHEDULE_SLOP)) { status = -EFBIG; goto fail; |