linux-kernel - Re: [PATCH] jme: remove the jme driver as it is no longer maintained

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Message-ID: <CA+ToGPEQwdOvgN3OHEjHLrnAyQsCR7zHzvtHmYeKZzoq26ehjQ@mail.gmail.com>
Date:	Sun, 21 Feb 2016 14:17:23 -0300
From:	Diego Viola <diego.viola@...il.com>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, davem@...emloft.net,
	netdev@...r.kernel.org, cooldavid@...ldavid.org
Subject: Re: [PATCH] jme: remove the jme driver as it is no longer maintained

On Sun, Feb 21, 2016 at 9:45 AM, One Thousand Gnomes
<gnomes@...rguk.ukuu.org.uk> wrote:
>> I would appreciate some hint from someone who is more experienced with drivers.
>
> Start by testing
>
> - loading the driver as a module
> - using the networking
> - unloading the module (and checking it stays unloaded!)
>
> then suspend/resume
>
> If that works then you have a good starting point because you know a
> sequence of actions that suspends properly. If it fails then it's going
> to be rather more fun because it implies something in the hardware has
> not been properly shut down.
>
> Alan

Hi Alan,

Thanks for your email, did you see my bug report? Because I tried all
this already.

The only workarounds I've found to work is one of these:

$ rmmod jme # before suspend

or

$ ip link set ens34 down

or

$ echo 0 > /sys/power/pm_async # disable async power management

Then resume works fine (I can't reproduce the hang).

I'm not a C developer nor a kernel developer, I tried looking at the
jme.c driver code but it's not clear what is broken and what needs
fixing, so I would appreciate someone more experienced looking at the
issue and giving me an idea or two.

Thanks,
Diego