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Commit f8269c19 authored by Philipp Zabel's avatar Philipp Zabel Committed by Rafael J. Wysocki
Browse files

cpufreq: imx6q: Drop devm_clk/regulator_get usage 



This driver is using devres managed calls incorrectly, giving the cpu0
device as first parameter instead of the cpufreq platform device.
This results in resources not being freed if the cpufreq platform device
is unbound, for example if probing has to be deferred for a missing
regulator.
Supporting probe deferral properly is a prerequisite to enabling the
internal LDO bypass on i.MX6 and regulating the CPU voltage with an
external regulator.

Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Acked-by: default avatarShawn Guo <shawn.guo@freescale.com>
Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent e54173b4

drivers/cpufreq/imx6q-cpufreq.c

+39 −14
Original line number Diff line number Diff line
@@ -170,25 +170,25 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev) 
		return -ENOENT;

	}



	arm_clk = devm_clk_get(cpu_dev, "arm");

	pll1_sys_clk = devm_clk_get(cpu_dev, "pll1_sys");

	pll1_sw_clk = devm_clk_get(cpu_dev, "pll1_sw");

	step_clk = devm_clk_get(cpu_dev, "step");

	pll2_pfd2_396m_clk = devm_clk_get(cpu_dev, "pll2_pfd2_396m");

	arm_clk = clk_get(cpu_dev, "arm");

	pll1_sys_clk = clk_get(cpu_dev, "pll1_sys");

	pll1_sw_clk = clk_get(cpu_dev, "pll1_sw");

	step_clk = clk_get(cpu_dev, "step");

	pll2_pfd2_396m_clk = clk_get(cpu_dev, "pll2_pfd2_396m");

	if (IS_ERR(arm_clk) || IS_ERR(pll1_sys_clk) || IS_ERR(pll1_sw_clk) ||

	    IS_ERR(step_clk) || IS_ERR(pll2_pfd2_396m_clk)) {

		dev_err(cpu_dev, "failed to get clocks\n");

		ret = -ENOENT;

		goto put_node;

		goto put_clk;

	}



	arm_reg = devm_regulator_get(cpu_dev, "arm");

	pu_reg = devm_regulator_get(cpu_dev, "pu");

	soc_reg = devm_regulator_get(cpu_dev, "soc");

	arm_reg = regulator_get(cpu_dev, "arm");

	pu_reg = regulator_get(cpu_dev, "pu");

	soc_reg = regulator_get(cpu_dev, "soc");

	if (IS_ERR(arm_reg) || IS_ERR(pu_reg) || IS_ERR(soc_reg)) {

		dev_err(cpu_dev, "failed to get regulators\n");

		ret = -ENOENT;

		goto put_node;

		goto put_reg;

	}



	/*
@@ -201,21 +201,21 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev) 
		ret = of_init_opp_table(cpu_dev);

		if (ret < 0) {

			dev_err(cpu_dev, "failed to init OPP table: %d\n", ret);

			goto put_node;

			goto put_reg;

		}



		num = dev_pm_opp_get_opp_count(cpu_dev);

		if (num < 0) {

			ret = num;

			dev_err(cpu_dev, "no OPP table is found: %d\n", ret);

			goto put_node;

			goto put_reg;

		}

	}



	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);

	if (ret) {

		dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);

		goto put_node;

		goto put_reg;

	}



	/* Make imx6_soc_volt array's size same as arm opp number */
@@ -301,7 +301,24 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev) 


free_freq_table:

	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);

put_node:

put_reg:

	if (!IS_ERR(arm_reg))

		regulator_put(arm_reg);

	if (!IS_ERR(pu_reg))

		regulator_put(pu_reg);

	if (!IS_ERR(soc_reg))

		regulator_put(soc_reg);

put_clk:

	if (!IS_ERR(arm_clk))

		clk_put(arm_clk);

	if (!IS_ERR(pll1_sys_clk))

		clk_put(pll1_sys_clk);

	if (!IS_ERR(pll1_sw_clk))

		clk_put(pll1_sw_clk);

	if (!IS_ERR(step_clk))

		clk_put(step_clk);

	if (!IS_ERR(pll2_pfd2_396m_clk))

		clk_put(pll2_pfd2_396m_clk);

	of_node_put(np);

	return ret;

}
@@ -310,6 +327,14 @@ static int imx6q_cpufreq_remove(struct platform_device *pdev) 
{

	cpufreq_unregister_driver(&imx6q_cpufreq_driver);

	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);

	regulator_put(arm_reg);

	regulator_put(pu_reg);

	regulator_put(soc_reg);

	clk_put(arm_clk);

	clk_put(pll1_sys_clk);

	clk_put(pll1_sw_clk);

	clk_put(step_clk);

	clk_put(pll2_pfd2_396m_clk);



	return 0;

}