Re: [RESEND PATCH] ASoC: core: Exit all links before removing their components

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On 2022-10-27 10:58 AM, Cezary Rojewski wrote:
Flows leading to link->init() and link->exit() are not symmetric.
Currently the relevant part of card probe sequence goes as:

	for_each_card_rtds(card, rtd)
		for_each_rtd_components(rtd, i, component)
			component->probe()
	for_each_card_rtds(card, rtd)
		for_each_rtd_dais(rtd, i, dai)
			dai->probe()
	for_each_card_rtds(card, rtd)
		rtd->init()

On the other side, equivalent remove sequence goes as:

	for_each_card_rtds(card, rtd)
		for_each_rtd_dais(rtd, i, dai)
			dai->remove()
	for_each_card_rtds(card, rtd)
		for_each_rtd_components(rtd, i, component)
			component->remove()
	for_each_card_rtds(card, rtd)
		rtd->exit()

what can lead to errors as link->exit() may still operate on resources
owned by its components despite the probability of them being freed
during the component->remove().

This change modifies the remove sequence to:

	for_each_card_rtds(card, rtd)
		rtd->exit()
	for_each_card_rtds(card, rtd)
		for_each_rtd_dais(rtd, i, dai)
			dai->remove()
	for_each_card_rtds(card, rtd)
		for_each_rtd_components(rtd, i, component)
			component->remove()

so code found in link->exit() is safe to touch any component stuff as
component->remove() has not been called yet.


As this is connected (and is a dependency) for some jack-handler refactoring in Intel boards, perhaps it will be better if I send this patch as part of a series? Lacks some context.


Regards,
Czarek



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