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authorMaciej S. Szmigiero <maciej.szmigiero@oracle.com>2022-10-20 22:46:21 +0200
committerTakashi Iwai <tiwai@suse.de>2022-10-21 08:17:08 +0200
commit966f015fe4329199cc49084ee2886cfb626b34d3 (patch)
treeb2385617043d48f185a0047e9333f8aff20cddfb
parent4881bda5ea05c8c240fc8afeaa928e2bc43f61fa (diff)
ALSA: control: add snd_ctl_rename()
Add a snd_ctl_rename() function that takes care of updating the control hash entries for callers that already have the relevant struct snd_kcontrol at hand and hold the control write lock (or simply haven't registered the card yet). Fixes: c27e1efb61c5 ("ALSA: control: Use xarray for faster lookups") Cc: stable@vger.kernel.org Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com> Link: https://lore.kernel.org/r/4170b71117ea81357a4f7eb8410f7cde20836c70.1666296963.git.maciej.szmigiero@oracle.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--include/sound/control.h1
-rw-r--r--sound/core/control.c23
2 files changed, 24 insertions, 0 deletions
diff --git a/include/sound/control.h b/include/sound/control.h
index eae443ba79ba..cc3dcc6cfb0f 100644
--- a/include/sound/control.h
+++ b/include/sound/control.h
@@ -138,6 +138,7 @@ int snd_ctl_remove(struct snd_card * card, struct snd_kcontrol * kcontrol);
int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, bool add_on_replace);
int snd_ctl_remove_id(struct snd_card * card, struct snd_ctl_elem_id *id);
int snd_ctl_rename_id(struct snd_card * card, struct snd_ctl_elem_id *src_id, struct snd_ctl_elem_id *dst_id);
+void snd_ctl_rename(struct snd_card *card, struct snd_kcontrol *kctl, const char *name);
int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id, int active);
struct snd_kcontrol *snd_ctl_find_numid(struct snd_card * card, unsigned int numid);
struct snd_kcontrol *snd_ctl_find_id(struct snd_card * card, struct snd_ctl_elem_id *id);
diff --git a/sound/core/control.c b/sound/core/control.c
index a7271927d875..50e7ba66f187 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -753,6 +753,29 @@ int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
}
EXPORT_SYMBOL(snd_ctl_rename_id);
+/**
+ * snd_ctl_rename - rename the control on the card
+ * @card: the card instance
+ * @kctl: the control to rename
+ * @name: the new name
+ *
+ * Renames the specified control on the card to the new name.
+ *
+ * Make sure to take the control write lock - down_write(&card->controls_rwsem).
+ */
+void snd_ctl_rename(struct snd_card *card, struct snd_kcontrol *kctl,
+ const char *name)
+{
+ remove_hash_entries(card, kctl);
+
+ if (strscpy(kctl->id.name, name, sizeof(kctl->id.name)) < 0)
+ pr_warn("ALSA: Renamed control new name '%s' truncated to '%s'\n",
+ name, kctl->id.name);
+
+ add_hash_entries(card, kctl);
+}
+EXPORT_SYMBOL(snd_ctl_rename);
+
#ifndef CONFIG_SND_CTL_FAST_LOOKUP
static struct snd_kcontrol *
snd_ctl_find_numid_slow(struct snd_card *card, unsigned int numid)