linux-kernel - Re: [PATCH 1/2] mfd: core: Add the option to order destruction of MFD cells

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Message-ID: <20140602210117.GO31751@sirena.org.uk>
Date:	Mon, 2 Jun 2014 22:01:17 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	lee.jones@...aro.org, sameo@...ux.intel.com,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mfd: core: Add the option to order destruction of
 MFD cells

On Mon, Jun 02, 2014 at 10:01:43AM +0100, Charles Keepax wrote:
> Sometimes MFD children will have interdependancies. For example an MFD
> device might contain a regulator cell and another cell which requires
> that regulator to function. Probe deferral will ensure that these
> devices probe in the correct order, however currently nothing ensures
> they are destroyed in the correct order. As such it is possible for a
> cell to be destroyed whilst another cell still expects it to exist. For
> example the cell mentioned earlier would attempt to do a regulator_put
> as part of its own tear-down but the regulator may have already been
> destroyed.

Probe deferral is supposed to handle removal too, we're supposed to be
able to walk the device list in reverse order and everything just work.

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