linux-kernel - linux v4.14 causes firmware iwlwifi errors on Lenovo Thinkpad T440s

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Message-ID: <CAMRc=Mf92X2t8wjmE+xkXrA0QKY06uFeXhMY-97Ka=_UxuQbjw@mail.gmail.com>
Date:   Mon, 13 Nov 2017 21:19:01 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     linux-kernel@...r.kernel.org,
        linux-wireless@...r.kernel.orgjohannes,
        Berg <johannes.berg@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Intel Linux Wireless <linuxwifi@...el.com>
Subject: linux v4.14 causes firmware iwlwifi errors on Lenovo Thinkpad T440s

Hi,

I noticed my wireless interface can't get up with linux v4.14 and the
kernel log is flooded with firmware errors:

iwlwifi 0000:03:00.0: Firmware error during reconfiguration - reprobe!
iwlwifi 0000:03:00.0: FW error in SYNC CMD DQA_ENABLE_CMD

and

ieee80211 phy63: Hardware restart was requested.

The wireless controller is: Intel Corporation Wireless 7260 (rev 83)
Firmware used is: iwlwifi-7260-17

Everything works fine with v4.13.12.

I didn't have time today to bisect for the offending commit. Full log
uploaded[1].

Best regards,
Bartosz Golaszewski

[1] https://pastebin.com/jksqxvS6