Re: [PATCH 1/2] cpufreq: mediatek: Add MT8173 cpufreq driver

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On Mon, Apr 20, 2015 at 05:27:26PM +0800, pi-cheng.chen wrote:
> This patch implements MT8173 specific cpufreq driver with OPP table defined
> in the driver code.
> 
> Signed-off-by: pi-cheng.chen <pi-cheng.chen@xxxxxxxxxx>
> ---
>  drivers/cpufreq/Kconfig.arm      |   6 +
>  drivers/cpufreq/Makefile         |   1 +
>  drivers/cpufreq/mt8173-cpufreq.c | 509 +++++++++++++++++++++++++++++++++++++++
>  3 files changed, 516 insertions(+)
>  create mode 100644 drivers/cpufreq/mt8173-cpufreq.c
> 
> diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
> index 1b06fc4..25643c7 100644
> --- a/drivers/cpufreq/Kconfig.arm
> +++ b/drivers/cpufreq/Kconfig.arm
> +
> +static int mt8173_cpufreq_dvfs_init(struct cpu_dvfs_info *info)
> +{
> +	struct device *cpu_dev;
> +	struct regulator *proc_reg, *sram_reg;
> +	struct clk *cpu_clk, *inter_pll;
> +	unsigned long rate;
> +	int cpu, ret;
> +
> +	cpu = cpumask_first(&info->cpus);
> +
> +try_next_cpu:
> +	cpu_dev = get_cpu_device(cpu);
> +	proc_reg = regulator_get_exclusive(cpu_dev, "proc");
> +	sram_reg = regulator_get_exclusive(cpu_dev, "sram");
> +	cpu_clk = clk_get(cpu_dev, "cpu");
> +	inter_pll = clk_get(cpu_dev, "intermediate");
> +
> +	if (IS_ERR_OR_NULL(proc_reg) || IS_ERR_OR_NULL(cpu_clk) ||
> +	    IS_ERR_OR_NULL(inter_pll)) {
> +		cpu = cpumask_next(cpu, &info->cpus);
> +		if (cpu >= nr_cpu_ids)
> +			return -ENODEV;
> +
> +		goto try_next_cpu;
> +	}

Please keep an eye on the error pathes. This one is quite broken. You
get references to resources here which you never release. Also
-EPROBE_DEFER is a valid return value from regulator_get which is not
handled here.

Also IS_ERR_OR_NULL() is most probably wrong here. Should be IS_ERR().

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]
  Powered by Linux