netdev - Re: 4.12-RC2 BUG: scheduling while atomic: irq/47-iwlwifi

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Message-ID: <764a929c-ce8a-c859-a49e-2f20cb05ae44@broadcom.com>
Date:   Mon, 22 May 2017 14:09:53 +0200
From:   Arend van Spriel <arend.vanspriel@...adcom.com>
To:     Johannes Berg <johannes@...solutions.net>,
        Sander Eikelenboom <linux@...elenboom.it>,
        linux-wireless <linux-wireless@...r.kernel.org>
Cc:     netdev@...r.kernel.org
Subject: Re: 4.12-RC2 BUG: scheduling while atomic: irq/47-iwlwifi

On 5/22/2017 12:57 PM, Johannes Berg wrote:
> On Mon, 2017-05-22 at 12:36 +0200, Sander Eikelenboom wrote:
>> Hi,
>>
>> I encountered this splat with 4.12-RC2.
> 
> Ugh, yeah, I should've seen that in the review.
> 
> Arend, please take a look at this. cfg80211_sched_scan_results() cannot
> sleep, so you can't rtnl_lock() in there. Looks like you can just rely
> on RCU though?

I see. I think you are right on RCU. Don't have the code in front of me 
now, but I think the lookup has an ASSERT_RTNL. Will look into it after 
my monday meeting :-p

Regards,
Arend