[PATCH] usb: ehci: fix update qtd->token in qh_append_tds

[Ming Lei]

Hi Alan,

Thanks for your comment.

On Tue, Aug 30, 2011 at 12:33 AM, Alan Stern <stern at rowland.harvard.edu> wrote:
> Nevertheless, it remains true that you want to add a memory barrier
> instruction simply in order to speed up a cache writeback, not to force
> any sort of ordering.  This needs to be explained carefully in the code
> (not just in the patch description!) and it needs to be done in a way
> that won't affect other architectures.

OK, will do it.

> Also, as you mentioned before, you may want to do the same thing in
> qh_link_async() just after the
>
>        head->hw->hw_next = dma;
>
> line.  Delays in flushing that write would also slow down performance.

Will do it too.


thanks,
--
Ming Lei