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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