linux-kernel - [PATCH] ALSA: sound: Increase max size of components field

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Message-ID: <20251023092754.84095-1-mstrozek@opensource.cirrus.com>
Date: Thu, 23 Oct 2025 10:27:41 +0100
From: Maciej Strozek <mstrozek@...nsource.cirrus.com>
To: Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc: alsa-devel@...a-project.org, patches@...nsource.cirrus.com,
        linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org,
        Maciej Strozek <mstrozek@...nsource.cirrus.com>
Subject: [PATCH] ALSA: sound: Increase max size of components field

The components field of snd_card can run out of space in new systems which
use many audio devices, hence increase its size to 256 bytes.

Along with this change, bump the CTL protocol version to 2.0.10

Signed-off-by: Maciej Strozek <mstrozek@...nsource.cirrus.com>
---
 include/sound/core.h        | 2 +-
 include/uapi/sound/asound.h | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/sound/core.h b/include/sound/core.h
index 64327e971122..0eb2e3ee0dd5 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -87,7 +87,7 @@ struct snd_card {
 	char longname[80];		/* name of this soundcard */
 	char irq_descr[32];		/* Interrupt description */
 	char mixername[80];		/* mixer name */
-	char components[128];		/* card components delimited with
+	char components[256];		/* card components delimited with
 								space */
 	struct module *module;		/* top-level module */

diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
index 5a049eeaecce..c302698fb685 100644
--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -1058,7 +1058,7 @@ struct snd_timer_tread {
  *                                                                          *
  ****************************************************************************/

-#define SNDRV_CTL_VERSION		SNDRV_PROTOCOL_VERSION(2, 0, 9)
+#define SNDRV_CTL_VERSION		SNDRV_PROTOCOL_VERSION(2, 0, 10)

 struct snd_ctl_card_info {
 	int card;			/* card number */
@@ -1069,7 +1069,7 @@ struct snd_ctl_card_info {
 	unsigned char longname[80];	/* name + info text about soundcard */
 	unsigned char reserved_[16];	/* reserved for future (was ID of mixer) */
 	unsigned char mixername[80];	/* visual mixer identification */
-	unsigned char components[128];	/* card components / fine identification, delimited with one space (AC97 etc..) */
+	unsigned char components[256];	/* card components / fine identification, delimited with one space (AC97 etc..) */
 };

 typedef int __bitwise snd_ctl_elem_type_t;
--
2.48.1