netdev - Re: [PATCH 1/2] mwifiex: Use non-posted PCI register writes

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Message-ID: <CAHp75VeKws85JMG_GjYPzgcqu7pGf66bLbUowNi-4z_=uda+HQ@mail.gmail.com>
Date:   Wed, 1 Sep 2021 18:47:46 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jonas Dreßler <verdre@...d.nl>
Cc:     Amitkumar Karwar <amitkarwar@...il.com>,
        Ganapathi Bhat <ganapathi017@...il.com>,
        Xinming Hu <huxinming820@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Tsuchiya Yuto <kitakar@...il.com>,
        "open list:TI WILINK WIRELES..." <linux-wireless@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Pali Rohár <pali@...nel.org>
Subject: Re: [PATCH 1/2] mwifiex: Use non-posted PCI register writes

On Wed, Sep 1, 2021 at 5:02 PM Jonas Dreßler <verdre@...d.nl> wrote:
> On 8/30/21 2:49 PM, Andy Shevchenko wrote:
>  > On Mon, Aug 30, 2021 at 3:38 PM Jonas Dreßler <verdre@...d.nl> wrote:

...

>  > Thanks for all this work!
>  >
>  > Nevertheless, do we have any commits that may be a good candidate to
>  > be in the Fixes tag here?

> I don't think there's any commit we could point to, given that the bug
> is probably somewhere in the firmware code.

Here (in the commit message)...

>  >> +       /* Do a read-back, which makes the write non-posted,
> ensuring the
>  >> +        * completion before returning.
>  >
>  >> +        * The firmware of the 88W8897 card is buggy and this avoids
> crashes.
>  >
>  > Any firmware version reference? Would be nice to have just for the
>  > sake of record.
>
> Pretty sure the crash is present in every firmware that has been
> released, I've tried most of them. FTR, the current firmware version is
> 15.68.19.p21.

...and here it would be nice to state this version, so in the future
we will have a right landmark.

>  >> +        */

-- 
With Best Regards,
Andy Shevchenko