linux-kernel - Re: [PATCH 1/5] clk: Remove prepare_lock hold assertion in __clk

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Message-ID: <CAD=FV=Vo2vpemyH1ChdHtUdaeKnGckBUeqKfL11xn3WsN5+BUw@mail.gmail.com>
Date: Mon, 25 Mar 2024 09:18:52 -0700
From: Doug Anderson <dianders@...omium.org>
To: Stephen Boyd <sboyd@...nel.org>
Cc: Michael Turquette <mturquette@...libre.com>, linux-kernel@...r.kernel.org, 
	linux-clk@...r.kernel.org, patches@...ts.linux.dev, 
	linux-arm-msm@...r.kernel.org, Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [PATCH 1/5] clk: Remove prepare_lock hold assertion in __clk_release()

Hi,

On Sun, Mar 24, 2024 at 10:44 PM Stephen Boyd <sboyd@...nel.org> wrote:
>
> Removing this assertion lets us move the kref_put() call outside the
> prepare_lock section. We don't need to hold the prepare_lock here to
> free memory and destroy the clk_core structure. We've already unlinked
> the clk from the clk tree and by the time the release function runs
> nothing holds a reference to the clk_core anymore so anything with the
> pointer can't access the memory that's being freed anyway. Way back in
> commit 496eadf821c2 ("clk: Use lockdep asserts to find missing hold of
> prepare_lock") we didn't need to have this assertion either.
>
> Fixes: 496eadf821c2 ("clk: Use lockdep asserts to find missing hold of prepare_lock")
> Cc: Krzysztof Kozlowski <krzk@...nel.org>
> Cc: Douglas Anderson <dianders@...omium.org>
> Signed-off-by: Stephen Boyd <sboyd@...nel.org>
> ---
>  drivers/clk/clk.c | 2 --
>  1 file changed, 2 deletions(-)

Reviewed-by: Douglas Anderson <dianders@...omium.org>