netdev - Re: [GIT PULL] Networking for v5.15

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Date:   Wed, 1 Sep 2021 12:41:31 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Luca Coelho <luciano.coelho@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-wireless@...r.kernel.org,
        Miri Korenblit <miriam.rachel.korenblit@...el.com>,
        Johannes Berg <johannes@...solutions.net>
Subject: Re: [GIT PULL] Networking for v5.15

On Wed, 1 Sep 2021 12:00:57 -0700 Linus Torvalds wrote:
> On Tue, Aug 31, 2021 at 1:37 PM Jakub Kicinski <kuba@...nel.org> wrote:
> >
> > No conflicts at the time of writing. There were conflicts with
> > char-misc but I believe Greg dropped the commits in question.  
> 
> Hmm. I already merged this earlier, but didn't notice a new warning on
> my desktop:

>   RTNL: assertion failed at net/wireless/core.c (61)
>   WARNING: CPU: 60 PID: 1720 at net/wireless/core.c:61
> wiphy_idx_to_wiphy+0xbf/0xd0 [cfg80211]
>   Call Trace:
>    nl80211_common_reg_change_event+0xf9/0x1e0 [cfg80211]
>    reg_process_self_managed_hint+0x23d/0x280 [cfg80211]
>    regulatory_set_wiphy_regd_sync+0x3a/0x90 [cfg80211]
>    iwl_mvm_init_mcc+0x170/0x190 [iwlmvm]
>    iwl_op_mode_mvm_start+0x824/0xa60 [iwlmvm]
>    iwl_opmode_register+0xd0/0x130 [iwlwifi]
>    init_module+0x23/0x1000 [iwlmvm]
> 
> They all seem to have that same issue, and it looks like the fix would
> be to get the RTN lock in iwl_mvm_init_mcc(), but I didn't really look
> into it very much.
> 
> This is on my desktop, and I actually don't _use_ the wireless on this
> machine. I assume it still works despite the warnings, but they should
> get fixed.
> 
> I *don't* see these warnings on my laptop where I actually use
> wireless, but that one uses ath10k_pci, so it seems this is purely a
> iwlwifi issue.
> 
> I can't be the only one that sees this. Hmm?

Mm. Looking thru the recent commits there is a suspicious rtnl_unlock()
in commit eb09ae93dabf ("iwlwifi: mvm: load regdomain at INIT stage").

CC Miri, Johannes