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

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Date:	Thu, 02 Jan 2014 16:01:29 -0500
From:	Mark Lord <mlord@...ox.com>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	walt <w41ter@...il.com>, Alan Stern <stern@...land.harvard.edu>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	David Laight <david.laight@...lab.com>,
	linux-usb@...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

On 14-01-02 02:15 PM, Sarah Sharp wrote:
> On Tue, Dec 31, 2013 at 12:40:16PM -0800, walt wrote:
..
>> Unfortunately this patch causes a regression when copying large files to my
>> outboard USB3 drive. (Nothing at all to do with networking.)
>>
>> When I try to copy a large (20GB) file to the USB3 drive, the copy dies after
>> about 7GB, the ext4 journal aborts and the drive is remounted read-only.
>>
>> This bug is 100% reproducible (always pretty close to 7GB) and reverting this
>> patch completely fixes the problem.
> 
> Ok, I had feared that would be a consequence of this patch.  I think the
> problem is that the usb-storage driver submitted an URB with more
> scatter-gather entries than would fit on the ring segment, the xHCI
> driver rejected the URB with -ENOMEM, and the SCSI core eventually gave
> up on the SCSI command.


Is there not a block layer / scheduler tunable for max sg entries or something?
-- 
Mark Lord
Real-Time Remedies Inc.
mlord@...ox.com
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