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21a00fb337
Some machine drivers allocate or request resources with snd_soc_link_init() phase of the card probe. These resources need to be properly released when removing a card, and this patch suggests a dual exit() callback. The exit() is invoked in soc_remove_pcm_runtime(), which is not completely symmetric with the init() invoked in soc_init_pcm_runtime(). Alternate solutions were considered, e.g. adding a .remove() callback for the platform driver, but that's not symmetrical at all and would be difficult to handle if there are more than one dailink implementing an .init(). We looked also into using .remove_dai_link() callback, but that would also be imbalanced. Note that because of the error handling in snd_soc_bind_card(), which jumps to probe_end, there is no way to guarantee the exit() is invoked with resources allocated in the init(). Prior to releasing those resources, implementations of the exit() callback shall check the resources are valid. Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com> Reviewed-by: Curtis Malainey <curtis@malainey.com> Link: https://lore.kernel.org/r/20200622154241.29053-2-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
28 lines
1.1 KiB
C
28 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* soc-link.h
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*
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* Copyright (C) 2019 Renesas Electronics Corp.
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* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
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*/
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#ifndef __SOC_LINK_H
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#define __SOC_LINK_H
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int snd_soc_link_init(struct snd_soc_pcm_runtime *rtd);
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void snd_soc_link_exit(struct snd_soc_pcm_runtime *rtd);
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int snd_soc_link_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
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struct snd_pcm_hw_params *params);
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int snd_soc_link_startup(struct snd_pcm_substream *substream);
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void snd_soc_link_shutdown(struct snd_pcm_substream *substream);
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int snd_soc_link_prepare(struct snd_pcm_substream *substream);
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int snd_soc_link_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params);
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void snd_soc_link_hw_free(struct snd_pcm_substream *substream);
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int snd_soc_link_trigger(struct snd_pcm_substream *substream, int cmd);
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int snd_soc_link_compr_startup(struct snd_compr_stream *cstream);
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void snd_soc_link_compr_shutdown(struct snd_compr_stream *cstream);
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int snd_soc_link_compr_set_params(struct snd_compr_stream *cstream);
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#endif /* __SOC_LINK_H */
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