linux-kernel - Re: [RFC PATCH] Revert "mwifiex: fix system hang problem after resume"

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Message-ID: <CAEhWJF==rVqrO3sWz2Sq-7kd=6=66rfJs7+9qu4dgeB3ONyYLg@mail.gmail.com>
Date:   Thu, 6 Apr 2017 10:02:31 +0530
From:   amit karwar <amitkarwar@...il.com>
To:     Brian Norris <briannorris@...omium.org>
Cc:     Amitkumar Karwar <akarwar@...vell.com>,
        Nishant Sarmukadam <nishants@...vell.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Jeffy Chen <jeffy.chen@...k-chips.com>
Subject: Re: [RFC PATCH] Revert "mwifiex: fix system hang problem after resume"

On Sat, Apr 1, 2017 at 1:51 AM, Brian Norris <briannorris@...omium.org> wrote:
> This reverts commit 437322ea2a36d112e20aa7282c869bf924b3a836.
>
> This above-mentioned "fix" does not actually do anything to prevent a
> race condition. It simply papers over it so that the issue doesn't
> appear.
>
> If this is a real problem, it should be explained better than the above
> commit does, and an alternative, non-racy solution should be found.
>
> For further reason to revert this: there's ot reason we can't try
> resetting the card when it's *actually* stuck in host-sleep mode. So
> instead, this is unnecessarily creating scenarios where we can't recover
> Wifi.
>
> Cc: Amitkumar Karwar <akarwar@...vell.com>
> Signed-off-by: Brian Norris <briannorris@...omium.org>
> ---
> Amit, please take a look. AIUI, your "fix" is wrong, and quite racy. If you
> still think it's needed, can you please propose an alternative? Or at least
> explain more why this is needed? Thanks.
>

I agree. Fix just covers the issue. We need to investigate why system
hangs when card reset is attempted in host sleep activated scenario.

Acked-by: Amitkumar Karwar <amitkarwar@...il.com>

Regards,
Amitkumar Karwar