From 37bb927d5bb45b5dafaf9769bbed974e28621654 Mon Sep 17 00:00:00 2001
From: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Date: Fri, 28 Apr 2023 11:59:40 +0200
Subject: [PATCH] ALSA: core: update comment on snd_card.controls_rwsem
Since commit 5bbb1ab5bd ("control: use counting semaphore as write lock
for ELEM_WRITE operation"), this has been locking the controls including
their values, not just the list of controls.
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230428095941.1706278-6-oswald.buddenhagen@gmx.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
include/sound/core.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/sound/core.h b/include/sound/core.h
index 3edc4ab08774..4ea5f66b59d7 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -98,7 +98,7 @@ struct snd_card {
struct device ctl_dev; /* control device */
unsigned int last_numid; /* last used numeric ID */
- struct rw_semaphore controls_rwsem; /* controls list lock */
+ struct rw_semaphore controls_rwsem; /* controls lock (list and values) */
rwlock_t ctl_files_rwlock; /* ctl_files list lock */
int controls_count; /* count of all controls */
size_t user_ctl_alloc_size; // current memory allocation by user controls.
--
2.30.9