linux-kernel - Re: [PATCH] regulator: core: Add devres versions of regulator

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Date:   Fri, 9 Aug 2019 16:11:14 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Chuhong Yuan <hslester96@...il.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regulator: core: Add devres versions of
 regulator_enable/disable

On Fri, Aug 09, 2019 at 11:03:52AM +0800, Chuhong Yuan wrote:
> I wrote a coccinelle script to detect possible chances
> of utilizing devm_() APIs to simplify the driver.
> The script found 147 drivers in total and 22 of them
> have be patched.

> Within the 125 left ones, at least 31 of them (24.8%)
> are hindered from benefiting from devm_() APIs because
> of lack of a devres version of regulator_enable().

I'm not super keen on managed versions of these functions since they're
very likely to cause reference counting issues between the probe/remove
path and the suspend/resume path which aren't obvious from the code, I'm
especially worried about double frees on release.

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