linux-kernel - Re: Suspicious RCU from iwlwifi driver

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Message-ID: <1449820834.2324.0.camel@sipsolutions.net>
Date:	Fri, 11 Dec 2015 09:00:34 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Laura Abbott <labbott@...hat.com>,
	Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
	Avri Altman <avri.altman@...el.com>
Cc:	Intel Linux Wireless <linuxwifi@...el.com>, netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Suspicious RCU from iwlwifi driver

Hi Laura,

>   drivers/net/wireless/intel/iwlwifi/mvm/sta.c:1226 suspicious
> rcu_dereference_protected() usage!

> If I revert 9513c5e18a0dc55a1fc9c890715098ba2315830b
> (iwlwifi: mvm: Avoid dereferencing sta if it was already flushed)
> The warning goes away. Known issue?

Thanks for the report - I at least hadn't seen this (or a fix for it)
yet, we'll take a look.

johannes
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