ALSA: hda: Comment about snd_hdac_bus_update_rirb() and spinlock
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Message ID 20191213163005.19116-1-tiwai@suse.de
State New
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Series
  • ALSA: hda: Comment about snd_hdac_bus_update_rirb() and spinlock
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Commit Message

Takashi Iwai Dec. 13, 2019, 4:30 p.m. UTC
The call of snd_hdac_bus_update_rirb() needs the bus->reg_lock
spinlock protection for concurrency.  Comment about it more
explicitly.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/hda/hdac_controller.c | 1 +
 1 file changed, 1 insertion(+)

Patch
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diff --git a/sound/hda/hdac_controller.c b/sound/hda/hdac_controller.c
index 01787081552d..b856184af37f 100644
--- a/sound/hda/hdac_controller.c
+++ b/sound/hda/hdac_controller.c
@@ -181,6 +181,7 @@  EXPORT_SYMBOL_GPL(snd_hdac_bus_send_cmd);
  * @bus: HD-audio core bus
  *
  * 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)
 {