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From: Sascha Hauer <s.hauer@pengutronix.de>
To: "pi-cheng.chen" <pi-cheng.chen@linaro.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>,
	Mike Turquette <mturquette@linaro.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	"Joe.C" <yingjoe.chen@mediatek.com>,
	Eddie Huang <eddie.huang@mediatek.com>,
	Howard Chen <ibanezchen@gmail.com>,
	fan.chen@mediatek.com, devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
	linaro-kernel@lists.linaro.org,
	linux-mediatek@lists.infradead.org
Subject: Re: [PATCH 1/2] cpufreq: mediatek: Add MT8173 cpufreq driver
Date: Thu, 30 Apr 2015 09:42:18 +0200	[thread overview]
Message-ID: <20150430074218.GH4946@pengutronix.de> (raw)
In-Reply-To: <1429522047-16675-2-git-send-email-pi-cheng.chen@linaro.org>

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@linaro.org>
> ---
>  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.                           |                             |
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  parent reply	other threads:[~2015-04-30  7:42 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-20  9:27 [PATCH v3 0/2] cpufreq: add cpufreq driver for Mediatek MT8173 SoC pi-cheng.chen
2015-04-20  9:27 ` [PATCH 1/2] cpufreq: mediatek: Add MT8173 cpufreq driver pi-cheng.chen
2015-04-20 14:17   ` Josh Cartwright
2015-04-20 18:31     ` Paul Bolle
2015-04-22  3:11     ` Pi-Cheng Chen
2015-04-22 14:33       ` Josh Cartwright
2015-04-20 18:28   ` Paul Bolle
2015-04-22  3:14     ` Pi-Cheng Chen
2015-04-23 12:01   ` Sascha Hauer
2015-04-24  6:46     ` Pi-Cheng Chen
2015-04-24 12:55       ` Sascha Hauer
2015-05-07  9:42         ` Pi-Cheng Chen
2015-04-23 12:56   ` Mark Rutland
2015-04-24  6:50     ` Pi-Cheng Chen
2015-04-29  6:06       ` Viresh Kumar
2015-04-30  7:42   ` Sascha Hauer [this message]
2015-05-07  9:40     ` Pi-Cheng Chen
2015-04-20  9:27 ` [PATCH 2/2] ARM64: mt8173: dts Add MT8173 cpufreq driver support pi-cheng.chen
2015-04-23 12:53   ` Mark Rutland
2015-04-24  7:09     ` Pi-Cheng Chen
2015-05-18 13:29       ` Pi-Cheng Chen

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