linux-kernel - Re: [PATCH] clk: scpi: don't add cpufreq device if the scpi dvfs node is disabled

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Message-ID: <d51628d1-c930-ec13-990c-97cc47d80472@poczta.onet.pl>
Date:   Sat, 7 Jan 2017 01:44:08 +0100
From:   Michał Zegan <webczat_200@...zta.onet.pl>
To:     Sudeep Holla <sudeep.holla@....com>, linux-clk@...r.kernel.org,
        Stephen Boyd <sboyd@...eaurora.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Neil Armstrong <narmstrong@...libre.com>
Subject: Re: [PATCH] clk: scpi: don't add cpufreq device if the scpi dvfs node
 is disabled

seems the patch works as intended.

W dniu 06.01.2017 o 13:34, Sudeep Holla pisze:
> Currently we add the virtual cpufreq device unconditionally even when
> the SCPI DVFS clock provider node is disabled. This will cause cpufreq
> driver to throw errors when it gets initailised on boot/modprobe and
> also when the CPUs are hot-plugged back in.
> 
> This patch fixes the issue by adding the virtual cpufreq device only if
> the SCPI DVFS clock provider is available and registered.
> 
> Fixes: 9490f01e2471 ("clk: scpi: add support for cpufreq virtual device")
> Reported-by: Michał Zegan <webczat_200@...zta.onet.pl>
> Cc: Neil Armstrong <narmstrong@...libre.com>
> Cc: Michael Turquette <mturquette@...libre.com>
> Cc: Stephen Boyd <sboyd@...eaurora.org>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---
>  drivers/clk/clk-scpi.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/clk/clk-scpi.c b/drivers/clk/clk-scpi.c
> index 2a3e9d8e88b0..96d37175d0ad 100644
> --- a/drivers/clk/clk-scpi.c
> +++ b/drivers/clk/clk-scpi.c
> @@ -290,13 +290,15 @@ static int scpi_clocks_probe(struct platform_device *pdev)
>  			of_node_put(child);
>  			return ret;
>  		}
> -	}
> -	/* Add the virtual cpufreq device */
> -	cpufreq_dev = platform_device_register_simple("scpi-cpufreq",
> -						      -1, NULL, 0);
> -	if (IS_ERR(cpufreq_dev))
> -		pr_warn("unable to register cpufreq device");
>  
> +		if (match->data != &scpi_dvfs_ops)
> +			continue;
> +		/* Add the virtual cpufreq device if it's DVFS clock provider */
> +		cpufreq_dev = platform_device_register_simple("scpi-cpufreq",
> +							      -1, NULL, 0);
> +		if (IS_ERR(cpufreq_dev))
> +			pr_warn("unable to register cpufreq device");
> +	}
>  	return 0;
>  }
>  
> 



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