Regression in 5.15-rc6 - WARNING: possible circular locking dependency detected

[Mark Brown]

On Mon, Oct 25, 2021 at 10:02:29AM +0200, Francesco Dolcini wrote:

> Whoops, this seems something else already addressed here https://lore.kernel.org/all/1634886750-13861-4-git-send-email-hongxing.zhu@nxp.com/,
> sorry.

That patch looks buggy, there's a reference counting problem somewhere
which this is just papering over.  If the regulator is shared it could
drop a reference that some other device took, drivers should pretty much
never use regulator_is_enabled() except when initialising and certainly
not in cleanup paths.
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