From owner-svn-src-user@FreeBSD.ORG  Thu Oct 14 20:17:53 2010
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From: Hans Petter Selasky <hselasky@c2i.net>
To: Weongyo Jeong <weongyo@freebsd.org>
Date: Thu, 14 Oct 2010 22:19:08 +0200
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Cc: "src-committers@freebsd.org" <src-committers@freebsd.org>,
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Subject: Re: svn commit: r213847 - user/weongyo/usb/sys/dev/usb
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On Thursday 14 October 2010 22:04:05 Weongyo Jeong wrote:
> +       for (i = 0; i < up->up_frames; i++) {
> +               if (ptr + sizeof(u_int32_t) >= end)
> +                       goto done;
> +               *((u_int32_t *)ptr) = xfer->frlengths[i];
> +               ptr += sizeof(u_int32_t);
> +
> +               if (ptr + xfer->frlengths[i] >= end)
> +                       goto done;
> +               usbd_get_page(&xfer->frbuffers[i], 0, &res);
> +               bcopy(res.buffer, ptr, xfer->frlengths[i]);
> +               ptr += xfer->frlengths[i];
> +       }

For isochronous transfers only the first frbuffer is used for all transfers, 
which are back to back.

--HPS