linux-kernel - Re: [PATCH] clk: at91: fix possible dead lock in new drivers

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Message-ID: <159558270306.3847286.15644620940013309349@swboyd.mtv.corp.google.com>
Date:   Fri, 24 Jul 2020 02:25:03 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>
Cc:     kernel@...gutronix.de, Ahmad Fatoum <a.fatoum@...gutronix.de>,
        Michael Turquette <mturquette@...libre.com>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: at91: fix possible dead lock in new drivers

Quoting Ahmad Fatoum (2020-07-03 00:32:35)
> syscon_node_to_regmap() will make the created regmap get and enable the
> first clock it can parse from the device tree. This clock is not needed to
> access the registers and should not be enabled at that time.
> 
> Use device_node_to_regmap to resolve this as it looks up the regmap in
> the same list but doesn't care about the clocks. This issue is detected
> by lockdep when booting the sama5d3 with a device tree containing the
> new clk bindings.
> 
> This fix already happened in 6956eb33abb5 ("clk: at91: fix possible
> deadlock") for the drivers that had been migrated to the new clk binding
> back then. This does the same for the new drivers as well.
> 
> Fixes: 01e2113de9a5 ("clk: at91: add sam9x60 pmc driver")
> Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
> ---

Applied to clk-next