linux-kernel - Re: [PATCH] clk: at91: check pmc node status before registering syscore ops

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Date:   Mon, 13 Sep 2021 13:38:50 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <clement.leger@...tlin.com>, <mturquette@...libre.com>,
        <sboyd@...nel.org>, <Nicolas.Ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <Ludovic.Desroches@...rochip.com>
CC:     <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: at91: check pmc node status before registering
 syscore ops

On 13.09.2021 11:26, Clément Léger wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Currently, at91 pmc driver always register the syscore_ops whatever
> the status of the pmc node that has been found. When set as secure
> and disabled, the pmc should not be accessed or this will generate
> abort exceptions.
> To avoid this, add a check on node availability before registering
> the syscore operations.
> 
> Signed-off-by: Clément Léger <clement.leger@...tlin.com>

Reviewed-by: Claudiu Beznea <claudiu.beznea@...rochip.com>

> ---
>  drivers/clk/at91/pmc.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
> index 20ee9dccee78..b40035b011d0 100644
> --- a/drivers/clk/at91/pmc.c
> +++ b/drivers/clk/at91/pmc.c
> @@ -267,6 +267,11 @@ static int __init pmc_register_ops(void)
>         if (!np)
>                 return -ENODEV;
> 
> +       if (!of_device_is_available(np)) {
> +               of_node_put(np);
> +               return -ENODEV;
> +       }
> +
>         pmcreg = device_node_to_regmap(np);
>         of_node_put(np);
>         if (IS_ERR(pmcreg))
> --
> 2.33.0
>