From: Takashi Iwai <tiwai@suse.de>
Date: Fri, 13 Dec 2019 16:30:05 +0000 (+0100)
Subject: ALSA: hda: Comment about snd_hdac_bus_update_rirb() and spinlock
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=651bbb9d5161ae7170bc19fec893b8bf05fc590f;p=openwrt%2Fstaging%2Fblogic.git

ALSA: hda: Comment about snd_hdac_bus_update_rirb() and spinlock

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>
---

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)
 {