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

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Date:   Thu, 2 Sep 2021 09:33:02 +0000
From:   "Coelho, Luciano" <luciano.coelho@...el.com>
To:     "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "johannes@...solutions.net" <johannes@...solutions.net>,
        "kuba@...nel.org" <kuba@...nel.org>
CC:     "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "Korenblit, Miriam Rachel" <miriam.rachel.korenblit@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "kvalo@...eaurora.org" <kvalo@...eaurora.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [GIT PULL] Networking for v5.15

On Wed, 2021-09-01 at 21:49 +0200, Johannes Berg wrote:
> On Wed, 2021-09-01 at 12:41 -0700, Jakub Kicinski wrote:
> > 
> > > 
> > > 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").
> 
> Huh! That's not the version of the commit I remember - it had an
> rtnl_lock() in there too (just before the mutex_lock)?! Looks like that
> should really be there, not sure how/where it got lost along the way.
> 
> That unbalanced rtnl_unlock() makes no sense anyway. Wonder why it
> doesn't cause more assertions/problems at that point, clearly it's
> unbalanced. Pretty sure it's missing the rtnl_lock() earlier in the
> function for some reason.
> 
> Luca and I will look at it tomorrow, getting late here, sorry. 

Right, the reason for this was a rebase damage.  We lost the
rtnl_lock() call when I rebased the patch on top of the tree without
iwlmei (which touch this same function).

Sorry for the trouble, I'll send the fix in a sec.

--
Cheers,
Luca.