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From: Johannes Berg <johannes@sipsolutions.net>
To: Jakub Kicinski <kuba@kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luca Coelho <luciano.coelho@intel.com>,
	Kalle Valo <kvalo@codeaurora.org>,
	David Miller <davem@davemloft.net>,
	Netdev <netdev@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-wireless@vger.kernel.org,
	Miri Korenblit <miriam.rachel.korenblit@intel.com>
Subject: Re: [GIT PULL] Networking for v5.15
Date: Wed, 01 Sep 2021 21:49:32 +0200	[thread overview]
Message-ID: <4dfae09cd2ea3f5fe4b8fa5097d1e0cc8a34e848.camel@sipsolutions.net> (raw)
In-Reply-To: <20210901124131.0bc62578@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>

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. 

johannes


  reply	other threads:[~2021-09-01 19:49 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-31 20:37 Jakub Kicinski
2021-08-31 23:56 ` pr-tracker-bot
2021-09-01 19:00 ` Linus Torvalds
2021-09-01 19:41   ` Jakub Kicinski
2021-09-01 19:49     ` Johannes Berg [this message]
2021-09-01 21:48       ` Larry Finger
2021-09-02  9:33       ` Coelho, Luciano
2021-09-02 10:11         ` [PATCH] iwlwifi: mvm: add rtnl_lock() in iwl_mvm_start_get_nvm() Luca Coelho
2021-09-02 10:39           ` David Miller
2021-09-02 15:55             ` Linus Torvalds
     [not found]         ` <CAP71bdV1eBm3f1qY0rfigK4VaW5icZ+hU0pw7g6fVM=hGbn7Xw@mail.gmail.com>
2021-09-02 17:16           ` [GIT PULL] Networking for v5.15 Linus Torvalds
2021-09-02  5:55     ` Larry Finger
2021-09-02  7:07       ` Johannes Berg
2021-09-02  0:02 ` John Stultz
2021-09-02  9:25   ` Dan Carpenter
2021-09-02  9:28     ` Srinivas Kandagatla
2021-09-02 10:08       ` [PATCH net] net: qrtr: revert check in qrtr_endpoint_post() Dan Carpenter
2021-09-02 10:40         ` patchwork-bot+netdevbpf
2021-09-04  3:08     ` [GIT PULL] Networking for v5.15 John Stultz

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