linux-kernel - Re: lockdep annotation for desc->request

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Message-ID: <alpine.DEB.2.20.1711131510010.1851@nanos>
Date:   Mon, 13 Nov 2017 15:11:45 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andrew Lunn <andrew@...n.ch>
cc:     Lucas Stach <l.stach@...gutronix.de>,
        Chris Healy <cphealy@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: lockdep annotation for desc->request_mutex

Andrew,

On Thu, 9 Nov 2017, Andrew Lunn wrote:

> Hi Thomas
> 
> I'm been given reports of a new lockdep splat while testing
> 4.14-rc8. It appears to be a false positive, due to missing lockdep
> annotation on desc->request_mutex. The driver is using two different
> interrupt descriptors via different paths. But without annotation,
> lockdep thinks it is the same mutex.

Hmm.

> Do you have patches adding a lockdep class for desc->request_mutex?

No. I think we should extend irq_set_lockdep_class() and hand in two keys
then.

Thanks,

	tglx