From ff16351e3f302a2913bd17da6ed8f195ab2139fd Mon Sep 17 00:00:00 2001
From: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Date: Mon, 23 Dec 2019 11:39:20 +0900
Subject: [PATCH] ALSA: ctl: remove dimen member from elem_info structure
Git-commit: ff16351e3f302a2913bd17da6ed8f195ab2139fd
Patch-mainline: v5.6-rc1
References: jsc#SLE-16518

The 'dimen' member of 'struct snd_ctl_elem_info' is designed to deliver
information to use an array of value as multi-dimensional values. This
feature is used just by echoaudio PCI driver, and fortunately it's not
used by the other applications than 'echomixer' in alsa-tools.

In a previous commit, usage of 'dimen' member is removed from echoaudio
PCI driver. Nowadays no driver/application use the feature.

This commit removes the member from structure.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20191223023921.8151-4-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>

---
 include/uapi/sound/asound.h |  6 +-----
 sound/core/control.c        | 32 --------------------------------
 2 files changed, 1 insertion(+), 37 deletions(-)

diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
index efd9e1398e07..06033fc78ee4 100644
--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -1040,11 +1040,7 @@ struct snd_ctl_elem_info {
 		} enumerated;
 		unsigned char reserved[128];
 	} value;
-	union {
-		unsigned short d[4];		/* dimensions */
-		unsigned short *d_ptr;		/* indirect - obsoleted */
-	} dimen;
-	unsigned char reserved[64-4*sizeof(unsigned short)];
+	unsigned char reserved[64];
 };
 
 struct snd_ctl_elem_value {
diff --git a/sound/core/control.c b/sound/core/control.c
index 7a4d8690ce41..3fa1171dc1c2 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -758,36 +758,6 @@ static int snd_ctl_elem_list(struct snd_card *card,
 	return err;
 }
 
-static bool validate_element_member_dimension(struct snd_ctl_elem_info *info)
-{
-	unsigned int members;
-	unsigned int i;
-
-	if (info->dimen.d[0] == 0)
-		return true;
-
-	members = 1;
-	for (i = 0; i < ARRAY_SIZE(info->dimen.d); ++i) {
-		if (info->dimen.d[i] == 0)
-			break;
-		members *= info->dimen.d[i];
-
-		/*
-		 * info->count should be validated in advance, to guarantee
-		 * calculation soundness.
-		 */
-		if (members > info->count)
-			return false;
-	}
-
-	for (++i; i < ARRAY_SIZE(info->dimen.d); ++i) {
-		if (info->dimen.d[i] > 0)
-			return false;
-	}
-
-	return members == info->count;
-}
-
 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
 			     struct snd_ctl_elem_info *info)
 {
@@ -1280,8 +1250,6 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
 	if (info->count < 1 ||
 	    info->count > max_value_counts[info->type])
 		return -EINVAL;
-	if (!validate_element_member_dimension(info))
-		return -EINVAL;
 	private_size = value_sizes[info->type] * info->count;
 
 	/*
-- 
2.16.4