linux-kernel - Re: [PATCH] iwlwifi: pcie: restore support for Killer Qu C0 NICs

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Message-ID: <20200221121135.GA9056@papaya>
Date:   Fri, 21 Feb 2020 14:11:35 +0200
From:   Leho Kraav <leho@...av.com>
To:     "Jan Alexander Steffens (heftig)" <jan.steffens@...il.com>
Cc:     Johannes Berg <johannes.berg@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Intel Linux Wireless <linuxwifi@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iwlwifi: pcie: restore support for Killer Qu C0 NICs

On Tue, Dec 24, 2019 at 06:16:39AM +0100, Jan Alexander Steffens (heftig) wrote:
> Commit 809805a820c6 ("iwlwifi: pcie: move some cfg mangling from
> trans_pcie_alloc to probe") refactored the cfg mangling. Unfortunately,
> in this process the lines which picked the right cfg for Killer Qu C0
> NICs after C0 detection were lost. These lines were added by commit
> b9500577d361 ("iwlwifi: pcie: handle switching killer Qu B0 NICs to
> C0").
> 
> I suspect this is more of the "merge damage" which commit 7cded5658329
> ("iwlwifi: pcie: fix merge damage on making QnJ exclusive") talks about.
> 
> Restore the missing lines so the driver loads the right firmware for
> these NICs.

This seems real, as upgrading 5.5.0 -> 5.5.5 just broke my iwlwifi on XPS 7390.
How come?