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>

diff --git a/include/sound/core.h b/include/sound/core.h
index 3edc4ab..4ea5f66 100644 (file)
--- 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.