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USB: EHCI: adjust error return code

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The USB stack uses error code -ENOSPC to indicate that the periodic
schedule is too full, with insufficient bandwidth to accommodate a new
allocation.  It uses -EFBIG to indicate that an isochronous transfer
could not be linked into the schedule because it would exceed the
number of isochronous packets the host controller driver can handle
(generally because the new transfer would extend too far into the
future).

ehci-hcd uses the wrong error code at one point.  This patch fixes it,
along with a misleading comment and debugging message.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2014-12-04 10:22:57 -05:00 committed by Greg Kroah-Hartman
parent 6d89252a99
commit c401e7b4a8
1 changed files with 3 additions and 3 deletions
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6
drivers/usb/host/ehci-sched.c
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@ -1604,11 +1604,11 @@ iso_stream_schedule (
*/
now2 = (now - base) & (mod - 1);
/* Is the schedule already full? */
/* Is the schedule about to wrap around? */
if (unlikely(!empty && start < period)) {
ehci_dbg(ehci, "iso sched full %p (%u-%u < %u mod %u)\n",
ehci_dbg(ehci, "request %p would overflow (%u-%u < %u mod %u)\n",
urb, stream->next_uframe, base, period, mod);
status = -ENOSPC;
status = -EFBIG;
goto fail;
}