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USB: iMX21: accept very late isochronous URBs

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Commit 24f531371d (USB: EHCI: accept very late isochronous URBs)
changed the isochronous API provided by ehci-hcd.  URBs submitted too
late, so that the time slots for all their packets have already
expired, are no longer rejected outright.  Instead the submission is
accepted, and the URB completes normally with a -EXDEV error for each
packet.  This is what client drivers expect.

The same policy should be implemented in imx21-hcd, but I don't know
enough about the hardware to do it.  As a second-best substitute, this
patch treats very late isochronous submissions as though the
URB_ISO_ASAP flag were set.  I don't have any way to test this change,
unfortunately.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Sascha Hauer <kernel@pengutronix.de>
CC: Martin Fuzzey <mfuzzey@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2013-09-24 15:48:05 -04:00 committed by Greg Kroah-Hartman
parent eefb3dd756
commit 8937669fd6
1 changed files with 4 additions and 4 deletions
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8
drivers/usb/host/imx21-hcd.c
View File

@ -824,13 +824,13 @@ static int imx21_hc_urb_enqueue_isoc(struct usb_hcd *hcd,
i = DIV_ROUND_UP(wrap_frame(
cur_frame - urb->start_frame),
urb->interval);
if (urb->transfer_flags & URB_ISO_ASAP) {
/* Treat underruns as if URB_ISO_ASAP was set */
if ((urb->transfer_flags & URB_ISO_ASAP) ||
i >= urb->number_of_packets) {
urb->start_frame = wrap_frame(urb->start_frame
+ i * urb->interval);
i = 0;
} else if (i >= urb->number_of_packets) {
ret = -EXDEV;
goto alloc_dmem_failed;
}
}
}