PM / devfreq: Fix devfreq_remove_device() to improve the sequence of resource free
This patch modify devfreq_remove_device() to improve the sequence of resource free. If executing existing devfreq_remove_device(), this function always executes _remove_devfreq() twice. In result, second _remove_devfreq() always return error value. So, This patch resolves complicated function sequence as following: [Flow sequence before modification] devfreq_remove_device() _remove_devfreq(devfreq, false) kfree(devfreq); /* Free devfreq */ if (!skip ...) { /* skip is false */ device_unregister(&devfreq->dev) put_device(&devfreq->dev); ... dev->release() devfreq_dev_release() _remove_devfreq(devfreq, true) <- Recall to free devfreq /* * Always return error without freeing resource because * already _remove_devfreq() frees the memory of devfreq. */ } [Flow sequence after modification] devfreq_remove_device device_unregister(&devfreq->dev) put_device(&devfreq->dev); .. dev->release() devfreq_dev_release() _remove_devfreq() kfree(devfreq); /* Free devfreq */ Change-Id: I8ce4801795539d281ff0ff0c7c73e7f98ba6fe7d Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [Merge conflict resolved by MyungJoo] Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Git-commit: 585fc83ece43be63d5775e536f855db33dd752cf Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git Signed-off-by: Junjie Wu <junjiew@codeaurora.org>
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@ -409,7 +409,7 @@ static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type,
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* @devfreq: the devfreq struct
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* @skip: skip calling device_unregister().
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*/
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static void _remove_devfreq(struct devfreq *devfreq, bool skip)
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static void _remove_devfreq(struct devfreq *devfreq)
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{
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mutex_lock(&devfreq_list_lock);
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if (IS_ERR(find_device_devfreq(devfreq->dev.parent))) {
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@ -427,11 +427,6 @@ static void _remove_devfreq(struct devfreq *devfreq, bool skip)
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if (devfreq->profile->exit)
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devfreq->profile->exit(devfreq->dev.parent);
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if (!skip && get_device(&devfreq->dev)) {
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device_unregister(&devfreq->dev);
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put_device(&devfreq->dev);
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}
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mutex_destroy(&devfreq->lock);
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kfree(devfreq);
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}
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@ -441,14 +436,12 @@ static void _remove_devfreq(struct devfreq *devfreq, bool skip)
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* @dev: the devfreq device
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*
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* This calls _remove_devfreq() if _remove_devfreq() is not called.
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* Note that devfreq_dev_release() could be called by _remove_devfreq() as
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* well as by others unregistering the device.
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*/
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static void devfreq_dev_release(struct device *dev)
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{
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struct devfreq *devfreq = to_devfreq(dev);
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_remove_devfreq(devfreq, true);
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_remove_devfreq(devfreq);
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}
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/**
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@ -559,7 +552,8 @@ int devfreq_remove_device(struct devfreq *devfreq)
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if (!devfreq)
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return -EINVAL;
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_remove_devfreq(devfreq, false);
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device_unregister(&devfreq->dev);
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put_device(&devfreq->dev);
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return 0;
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}
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