Dears,
the error log is :
==========================================================
474.348000] iso_stream_schedule:line=1514, request 8176bc00 would
overflow (3936+31 >= 3936)
[ 474.348000] iso_stream_schedule
[ 474.348000] mod=4096, sched->span=32
[ 474.348000] now=773
[ 474.348000] start=4709
[ 474.348000] next=773
[ 474.348000] period=1
[ 474.348000] uvcvideo: Failed to resubmit video URB (-27).
[ 474.352000] iso_stream_schedule:line=1514, request 8176b000 would
overflow (3932+31 >= 3936)
[ 474.352000] iso_stream_schedule
[ 474.352000] mod=4096, sched->span=32
[ 474.352000] now=784
[ 474.352000] start=4716
[ 474.352000] next=784
[ 474.352000] period=1
[ 474.352000] uvcvideo: Failed to resubmit video URB (-27).
==========================================================
it seems the index of schedule list is corrupt, right?
Thanks!
Best Regards,
Soho
2011/5/26 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>:
> On Thu, 26 May 2011, Soho Soho123 wrote:
>
>> Dears,
>>
>>
>> The check line still included in iso_stream_schedule(). in linux
>> 2.6.39. I check the code from linux archive
>> [linux/kernel/git/stable/linux-2.6.39.y.git] / drivers / usb / host /
>> ehci-sched.c, line 1488 ~1496
>> ===============================================
>> 1488 /* Tried to schedule too far into the future? */
>> 1489 if (unlikely(start - now + span - period
>> 1490 >= mod - 2 * SCHEDULE_SLOP)) {
>> 1491 ehci_dbg(ehci, "request %p would overflow (%d+%d >= %d)\n",
>> 1492 urb, start - now, span - period,
>> 1493 mod - 2 * SCHEDULE_SLOP);
>> 1494 status = -EFBIG;
>> 1495 goto fail;
>> 1496 }
>> ================================================
>> and
>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob_plain;f=drivers/usb/host/ehci-sched.c;hb=4a7df24ddc7097cd789a7527187826552ea0765e
>> ==================================================
>> 1492 /* Tried to schedule too far into the future? */
>> 1493 if (unlikely(start - now + span - period
>> 1494 >= mod - 2 * SCHEDULE_SLOP)) {
>> 1495 ehci_dbg(ehci, "request %p would overflow (%d+%d >= %d)\n",
>> 1496 urb, start - now, span - period,
>> 1497 mod - 2 * SCHEDULE_SLOP);
>> 1498 status = -EFBIG;
>> 1499 goto fail;
>> 1500 }
>> ==================================================
>
> Okay. This is different from the line you pointed out before.
>
>> The check line will get error "EFBIG" for urb_sumbit.
>> Could you kindly help confirm?
>
> Sure, it can happen. Do you have the output from the ehci_dbg()
> statement that gets triggered when the failure occurs?
>
> Alan Stern
>
>
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