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ALSA: hda: Comment about snd_hdac_bus_update_rirb() and spinlock

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The call of snd_hdac_bus_update_rirb() needs the bus->reg_lock
spinlock protection for concurrency.  Comment about it more
explicitly.

Link: https://lore.kernel.org/r/20191213163005.19116-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2019-12-13 17:30:05 +01:00
parent 1faa9d3a3e
commit 651bbb9d51
1 changed files with 1 additions and 0 deletions
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sound/hda/hdac_controller.c
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@ -181,6 +181,7 @@ EXPORT_SYMBOL_GPL(snd_hdac_bus_send_cmd);
* @bus: HD-audio core bus * @bus: HD-audio core bus
* *
* Usually called from interrupt handler. * Usually called from interrupt handler.
* The caller needs bus->reg_lock spinlock before calling this.
*/ */
void snd_hdac_bus_update_rirb(struct hdac_bus *bus) void snd_hdac_bus_update_rirb(struct hdac_bus *bus)
{ {