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From:   Serge Belyshev <belyshev@depni.sinp.msu.ru>
To:     Stuart Little <achirvasub@gmail.com>
Cc:     Johannes Berg <johannes.berg@intel.com>,
        Emmanuel Grumbach <emmanuel.grumbach@intel.com>,
        Luca Coelho <luciano.coelho@intel.com>,
        kernel list <linux-kernel@vger.kernel.org>,
        Intel Linux Wireless <linuxwifi@intel.com>,
        linux-wireless@vger.kernel.org,
        Haim Dreyfuss <haim.dreyfuss@intel.com>
Subject: Re: PROBLEM: 5.3.0-rc* causes iwlwifi failure
In-Reply-To: <20190817041258.GA1641@chirva-slack.chirva-slack>
References: <20190817041258.GA1641@chirva-slack.chirva-slack>
Date:   Sat, 17 Aug 2019 11:59:59 +0300
Message-ID: <87y2zsf9ps.fsf@depni.sinp.msu.ru>
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> I am on an Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz running Linux
> x86_64 (Slackware), with a custom-compiled 5.3.0-rc4 (.config
> attached).
>
> I am using the Intel wifi adapter on this machine:
>
> 02:00.0 Network controller: Intel Corporation Device 24fb (rev 10)
>
> with the iwlwifi driver. I am attaching the output to 'lspci -vv -s
> 02:00.0' as the file device-info.
>
> All 5.3.0-rc* versions I have tried (including rc4) cause multiple
> dmesg iwlwifi-related errors (dmesg attached). Examples:
>
> iwlwifi 0000:02:00.0: Failed to get geographic profile info -5
> iwlwifi 0000:02:00.0: Microcode SW error detected.  Restarting 0x82000000
> iwlwifi 0000:02:00.0: 0x00000038 | BAD_COMMAND
>

I have my logs filled with similar garbage throughout 5.3-rc*. Also
since 5.3-rcsomething not only it WARNS in dmesg about firmware failure,
but completely stops working after suspend/resume cycle.

It looks like that:

commit 4fd445a2c855bbcab81fbe06d110e78dbd974a5b
Author: Haim Dreyfuss <haim.dreyfuss@intel.com>
Date:   Thu May 2 11:45:02 2019 +0300

    iwlwifi: mvm: Add log information about SAR status
    
    Inform users when SAR status is changing.
    
    Signed-off-by: Haim Dreyfuss <haim.dreyfuss@intel.com>
    Signed-off-by: Luca Coelho <luciano.coelho@intel.com>


is the culprit. (manually) reverting it on top of 5.3-rc4 makes
everything work again.