linux-kernel - Re: [PATCH 4.4 50/53] ntb_transport: fix qp count bug

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Message-ID: <1506443547.1860.52.camel@codethink.co.uk>
Date:   Tue, 26 Sep 2017 17:32:27 +0100
From:   Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        Shyam Sundar S K <ssundark@....com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Allen Hubbe <Allen.Hubbe@...l.com>,
        Jon Mason <jdmason@...zu.us>
Subject: Re: [PATCH 4.4 50/53] ntb_transport: fix qp count bug

On Mon, 2017-08-28 at 10:05 +0200, Greg Kroah-Hartman wrote:
> 4.4-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Logan Gunthorpe <logang@...tatee.com>
> 
> commit cb827ee6ccc3e480f0d9c0e8e53eef55be5b0414 upstream.
> 
> In cases where there are more mw's than spads/2-2, the mw count gets
> reduced to match the limitation.
[...]

In 4.4-stable, it doesn't, so this patch doesn't fix anything.  It looks
like 4.4 would need a backport of:

commit b17faba03fc72091f4d040b879def004316952ec
Author: Shyam Sundar S K <ssundark@....com>
Date:   Wed Dec 7 22:37:05 2016 +0530

    ntb_transport: Limit memory windows based on available, scratchpads

Ben.

-- 
Ben Hutchings
Software Developer, Codethink Ltd.