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SubjectRe: [PATCH] clk: at91: fix possible dead lock in new drivers
On 03/07/2020 09:32:35+0200, Ahmad Fatoum wrote:
> 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@pengutronix.de>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

> ---
> Only boot tested on the sama5d3.
> ---
> drivers/clk/at91/at91sam9g45.c | 2 +-
> drivers/clk/at91/at91sam9n12.c | 2 +-
> drivers/clk/at91/sam9x60.c | 2 +-
> drivers/clk/at91/sama5d3.c | 2 +-
> 4 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/clk/at91/at91sam9g45.c b/drivers/clk/at91/at91sam9g45.c
> index 9873b583c260..fe9d391adeba 100644
> --- a/drivers/clk/at91/at91sam9g45.c
> +++ b/drivers/clk/at91/at91sam9g45.c
> @@ -111,7 +111,7 @@ static void __init at91sam9g45_pmc_setup(struct device_node *np)
> return;
> mainxtal_name = of_clk_get_parent_name(np, i);
>
> - regmap = syscon_node_to_regmap(np);
> + regmap = device_node_to_regmap(np);
> if (IS_ERR(regmap))
> return;
>
> diff --git a/drivers/clk/at91/at91sam9n12.c b/drivers/clk/at91/at91sam9n12.c
> index 630dc5d87171..4aa97e672bd6 100644
> --- a/drivers/clk/at91/at91sam9n12.c
> +++ b/drivers/clk/at91/at91sam9n12.c
> @@ -124,7 +124,7 @@ static void __init at91sam9n12_pmc_setup(struct device_node *np)
> return;
> mainxtal_name = of_clk_get_parent_name(np, i);
>
> - regmap = syscon_node_to_regmap(np);
> + regmap = device_node_to_regmap(np);
> if (IS_ERR(regmap))
> return;
>
> diff --git a/drivers/clk/at91/sam9x60.c b/drivers/clk/at91/sam9x60.c
> index 3e20aa68259f..2b4c67485eee 100644
> --- a/drivers/clk/at91/sam9x60.c
> +++ b/drivers/clk/at91/sam9x60.c
> @@ -178,7 +178,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
> return;
> mainxtal_name = of_clk_get_parent_name(np, i);
>
> - regmap = syscon_node_to_regmap(np);
> + regmap = device_node_to_regmap(np);
> if (IS_ERR(regmap))
> return;
>
> diff --git a/drivers/clk/at91/sama5d3.c b/drivers/clk/at91/sama5d3.c
> index 5e4e44dd4c37..5609b04e6565 100644
> --- a/drivers/clk/at91/sama5d3.c
> +++ b/drivers/clk/at91/sama5d3.c
> @@ -121,7 +121,7 @@ static void __init sama5d3_pmc_setup(struct device_node *np)
> return;
> mainxtal_name = of_clk_get_parent_name(np, i);
>
> - regmap = syscon_node_to_regmap(np);
> + regmap = device_node_to_regmap(np);
> if (IS_ERR(regmap))
> return;
>
> --
> 2.27.0
>

--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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