Re: [PATCH 3.12 033/118] usb: xhci: Link TRB must not occur withina USB payload burst

[walt]

On 12/18/2013 01:11 PM, Greg Kroah-Hartman wrote:
> 3.12-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: David Laight <David.Laight@xxxxxxxxxx>
> 
> commit 35773dac5f862cb1c82ea151eba3e2f6de51ec3e upstream.
> 
> Section 4.11.7.1 of rev 1.0 of the xhci specification states that a link TRB
> can only occur at a boundary between underlying USB frames (512 bytes for
> high speed devices).
> 
> If this isn't done the USB frames aren't formatted correctly and, for example,
> the USB3 ethernet ax88179_178a card will stop sending...


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.

(Note to Sarah:  I recently emailed you about this problem, and I *wrongly*
said that reverting the patch doesn't help.  That was a mistake, sorry.)

I'm happy to try any debugging suggestions/tricks.

BTW, please tell me if I've cc'd too many people.

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