linux-kernel - Re: [PATCH v2 1/2] i2c: tegra: Better handle case where CPU0 is busy for a long time

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Message-ID: <20200427153106.GA8113@kunai>
Date:   Mon, 27 Apr 2020 17:31:07 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Dmitry Osipenko <digetx@...il.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Manikanta Maddireddy <mmaddireddy@...dia.com>,
        Vidya Sagar <vidyas@...dia.com>, linux-i2c@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] i2c: tegra: Better handle case where CPU0 is busy
 for a long time


> Yes, that bug should be fixed anyway. But that doesn't justify breaking
> suspend/resume completely, which *is* a regression.
> 
> Look, I'm not saying that we should drop this patch altogether. All I'm
> saying is that we should postpone it so that we can: a) get suspend and
> resume working again (and by doing so make sure no other suspend/resume
> regressions silently creep in, because that always seems to happen when
> you're not looking) and b) fix any preexisting issues without possibly
> scrambling the result with this perhaps unrelated fix.
> 
> So, again, I think the safest road forward is to back this one out for
> now, fix whatever this other bug is and once suspend/resume is working
> properly again we can revisit this patch based on a known-good baseline.

I am with you here. I want to add that the proper fix should be
developed without thinking too much about stable in the first place.
*When* we have a proper working fix, then we can think about making it
"more" suitable for backporting. Yet, it may also be a result that older
kernels need a different solution. Or have no solution at all, in case
they can't do atomic_transfers and this is needed.

D'accord?


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