Registration and Release
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## Registration and Release

After all components are assigned, register the card instance by calling `snd_card_register()`. Access to the device files is enabled at this point. That is, before `snd_card_register()` is called, the components are safely inaccessible from external side. If this call fails, exit the probe function after releasing the card via `snd_card_free()`.

For releasing the card instance, you can call simply `snd_card_free()`. As mentioned earlier, all components are released automatically by this call.

For a device which allows hotplugging, you can use `snd_card_free_when_closed`. This one will postpone the destruction until all devices are closed.

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