forked from Minki/linux
47271b1b98
Current implementation of ALSA PCM core has a kernel API, snd_pcm_period_elapsed(), for drivers to queue event to awaken processes from waiting for available frames. The function voluntarily acquires lock of PCM substream, therefore it is not called in process context for any PCM operation since the lock is already acquired. It is convenient for packet-oriented driver, at least for drivers to audio and music unit in IEEE 1394 bus. The drivers are allowed by Linux FireWire subsystem to process isochronous packets queued till recent isochronous cycle in process context in any time. This commit adds snd_pcm_period_elapsed() variant, snd_pcm_period_elapsed_without_lock(), for drivers to queue the event in the process context. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20210610031733.56297-2-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de> |
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| .. | ||
| ac97 | ||
| aoa | ||
| arm | ||
| atmel | ||
| core | ||
| drivers | ||
| firewire | ||
| hda | ||
| i2c | ||
| isa | ||
| mips | ||
| oss | ||
| parisc | ||
| pci | ||
| pcmcia | ||
| ppc | ||
| sh | ||
| soc | ||
| sparc | ||
| spi | ||
| synth | ||
| usb | ||
| virtio | ||
| x86 | ||
| xen | ||
| ac97_bus.c | ||
| Kconfig | ||
| last.c | ||
| Makefile | ||
| sound_core.c | ||