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The internal PCM (aka DPCM backend PCM) doesn't need any registration procedure, thus currently we bail out immediately at dev_register callback. Similarly, its counterpart, dev_disconnect callback, is superfluous for the internal PCM. For simplifying and avoiding the conflicting disconnect call for internal PCM objects, this patch drops dev_register and dev_disconnect callbacks for the internal ops. The only uncertain thing by this action is whether skipping the PCM state change to SNDRV_PCM_STATE_DISCONNECT for the internal PCM is mandatory. Looking through the current implementations, this doesn't look so, hence dropping the whole dev_disconnect would make more sense. Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.