linux-kernel - Re: [PATCH] net: dsa: mv88e6060: Fix false positive lockdep splat

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Message-ID: <20151021161416.GG17207@lunn.ch>
Date:	Wed, 21 Oct 2015 18:14:16 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Neil Armstrong <narmstrong@...libre.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	Guenter Roeck <linux@...ck-us.net>,
	vivien.didelot@...oirfairelinux.com,
	Fabian Frederick <fabf@...net.be>,
	Pavel Nakonechny <pavel.nakonechny@...tlab.ru>,
	Joe Perches <joe@...ches.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, nbd@...nwrt.org,
	sergei.shtylyov@...entembedded.com
Subject: Re: [PATCH] net: dsa: mv88e6060: Fix false positive lockdep splat

On Wed, Oct 21, 2015 at 05:37:45PM +0200, Neil Armstrong wrote:
> Like the change made for mv88e6xxx, use mutex_lock_nested() to avoid
> lockdep to give false positives because of nested MDIO busses.

Hi Neil

We now have three instances of this, since mdio-mux.c has the same
code. Maybe now would be a good time to refactor this code into
mdiobus_read_nested() and mdiobus_write_nested() in mdio_bus.c?  At
the same time, add BUG_ON(in_interrupt()) similar to the non-nested
versions?

	Andrew
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