linux-kernel - Re: [PATCH] thunderbolt: Clear hops before overwriting

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Date:	Tue, 26 Aug 2014 08:54:18 -0700
From:	Greg KH <greg@...ah.com>
To:	Andreas Noever <andreas.noever@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thunderbolt: Clear hops before overwriting

On Tue, Aug 26, 2014 at 05:42:21PM +0200, Andreas Noever wrote:
> Zero hops in tb_path_activate before writing a new path.
> 
> This fixes the following scenario:
>  - Boot with a coldplugged device
>  - Unplug device
>  - Plug device back in
>  - PCI hotplug fails
> 
> The hotplug operation fails because our new path matches the (now
> defunct) path which was setup by the firmware for the coldplugged
> device. By writing zeros before writing our path configuration we can
> force thunderbolt to retrain the path.
> 
> Signed-off-by: Andreas Noever <andreas.noever@...il.com>
> ---
>  drivers/thunderbolt/path.c | 21 ++++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)

Should this get in for 3.17-final or can it wait for 3.18?  I'm thinking
3.17, but want to make sure.

thanks,

greg k-h
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