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
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