Re: OHCI: NULL or LIST_POISON dereference on ueagle-atm disconnection

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On Sat, Jun 04, 2016 at 10:05:27AM +0200, Michał Pecio wrote:
> > Hi, I think I have a bug in the OHCI driver.
> > 
> > Kernel version: 4.4.11 (some old 3.14 seems fine, didn't try others)
> 
> 3.18.34 and 4.7-rc1 are affected too.
> 
> The bug seems to have been introduced by "add I/O watchdog for orphan
> TDs" (81e38333). I couldn't run bisect because those old kernels don't
> build with gcc5+, but I started reverting commits to ohci-hcd.c and
> ohci-q.hcd on top of 3.18.34 and got things to work at this point:
> 
> commit 0831cb21003464f0764581fed26de83ac097d799
> Author: Michal Pecio <michal.pecio@xxxxxxxxx>
> Date:   Sat Jun 4 09:55:25 2016 +0200
> 
>     Revert "USB: OHCI: add I/O watchdog for orphan TDs"
>     
>     This reverts commit 81e38333513cec155c720432226dabe9f9f76a77.
> 
> commit cce8b2ec8e97a7c01fda1275e2a5732a1d0a1d88
> Author: Michal Pecio <michal.pecio@xxxxxxxxx>
> Date:   Sat Jun 4 09:53:58 2016 +0200
> 
>     Revert "USB: OHCI: add check for stopped frame counter"
>     
>     This reverts commit 499b3803d3e2f062f73bf22372b38393369ffcbf.

Alan, any ideas here?

Michał, please always cc: the people who wrote the patches that you
found problems with, makes things much easier :)

thanks,

greg k-h
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