linux-kernel - RE: [PATCH 3.12 033/118] usb: xhci: Link TRB must not occur within a USB payload burst [NEW HARDWARE]

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D4637FB@AcuExch.aculab.com>
Date:	Wed, 22 Jan 2014 09:17:18 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'walt' <w41ter@...il.com>,
	'Sarah Sharp' <sarah.a.sharp@...ux.intel.com>
CC:	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: RE: [PATCH 3.12 033/118] usb: xhci: Link TRB must not occur within
 a USB payload burst [NEW HARDWARE]

From: walt
> On 01/21/2014 01:51 AM, David Laight wrote:
> > From: Sarah Sharp
> >> On Mon, Jan 20, 2014 at 11:21:14AM +0000, David Laight wrote:
> > ...
> >>> A guess...
> >>>
> >>> In queue_bulk_sg_tx() try calling xhci_v1_0_td_remainder() instead
> >>> of xhci_td_remainder().
> >>
> David, I tried the one-liner below, which changed nothing AFAICS, but
> then I'm not sure it's the change you intended:
...
>  		/* Set the TRB length, TD size, and interrupter fields. */
> -		if (xhci->hci_version < 0x100) {
> +		if (xhci->hci_version > 0x100) {
>  			remainder = xhci_td_remainder(
>  					urb->transfer_buffer_length -
>  					running_total);

So my wild guess wasn't right.
Can't win them all.

	David