PM / devfreq: exynos4: Use devm_devfreq_* function using device resource management

This patch uses devm_devfreq_add_device()/devm_devfreq_register_opp_notifier()
to control automatically the resource of devfreq.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>

diff --git a/drivers/devfreq/exynos/exynos4_bus.c b/drivers/devfreq/exynos/exynos4_bus.c
index d257f1f..bebb0a4 100644 (file)
--- a/drivers/devfreq/exynos/exynos4_bus.c
+++ b/drivers/devfreq/exynos/exynos4_bus.c
@@ -979,7 +979,7 @@ static int exynos4_busfreq_probe(struct platform_device *pdev)
 
        platform_set_drvdata(pdev, data);
 
-       data->devfreq = devfreq_add_device(dev, &exynos4_devfreq_profile,
+       data->devfreq = devm_devfreq_add_device(dev, &exynos4_devfreq_profile,
                                           "simple_ondemand", NULL);
        if (IS_ERR(data->devfreq))
                return PTR_ERR(data->devfreq);
@@ -991,27 +991,20 @@ static int exynos4_busfreq_probe(struct platform_device *pdev)
        busfreq_mon_reset(ppmu_data);
 
        /* Register opp_notifier for Exynos4 busfreq */
-       err = devfreq_register_opp_notifier(dev, data->devfreq);
+       err = devm_devfreq_register_opp_notifier(dev, data->devfreq);
        if (err < 0) {
                dev_err(dev, "Failed to register opp notifier\n");
-               goto err_notifier_opp;
+               return err;
        }
 
        /* Register pm_notifier for Exynos4 busfreq */
        err = register_pm_notifier(&data->pm_notifier);
        if (err) {
                dev_err(dev, "Failed to setup pm notifier\n");
-               goto err_notifier_pm;
+               return err;
        }
 
        return 0;
-
-err_notifier_pm:
-       devfreq_unregister_opp_notifier(dev, data->devfreq);
-err_notifier_opp:
-       devfreq_remove_device(data->devfreq);
-
-       return err;
 }
 
 static int exynos4_busfreq_remove(struct platform_device *pdev)
@@ -1020,10 +1013,6 @@ static int exynos4_busfreq_remove(struct platform_device *pdev)
 
        /* Unregister all of notifier chain */
        unregister_pm_notifier(&data->pm_notifier);
-       devfreq_unregister_opp_notifier(data->dev, data->devfreq);
-
-       /* Remove devfreq instance */
-       devfreq_remove_device(data->devfreq);
 
        return 0;
 }