linux-kernel - Re: Lockdep warning in iwl_pcie_rx

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Date:   Mon, 01 Mar 2021 22:12:21 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     Jiri Kosina <jikos@...nel.org>,
        Luca Coelho <luciano.coelho@...el.com>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Lockdep warning in iwl_pcie_rx_handle()

Hi Jiri,

> I am getting the splat below with Linus' tree as of today (5.11-rc1, 
> fe07bfda2fb). I haven't started to look into the code yet, but apparently 
> this has been already reported by Heiner here:
> 
> 	https://www.spinics.net/lists/linux-wireless/msg208353.html
> 
> so before I start digging deep into it (the previous kernel this 
> particular machine had is 5.9, so I'd rather avoid lenghty bisect for now 
> in case someone has already looked into it and has ideas where the problem 
> is), I thought I'd ask whether this has been root-caused elsewhere 
> already.

Yeah, I'm pretty sure we have a fix for this, though I'm not sure right
now where it is in the pipeline.

It's called "iwlwifi: pcie: don't add NAPI under rxq->lock" but right
now I can't find it in any of the public archives.

johannes