linux-kernel - [PATCH] ALSA: compat_ioctl: use correct snd_ctl_elem_type

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Date:   Wed, 17 May 2023 06:38:05 +0800
From:   Min-Hua Chen <minhuadotchen@...il.com>
To:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     Min-Hua Chen <minhuadotchen@...il.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ALSA: compat_ioctl: use correct snd_ctl_elem_type_t type

SNDRV_CTL_ELEM_TYPE_* are type of snd_ctl_elem_type_t, we
have to __force cast them to int when comparing them with int
to fix the following sparse warnings.

sound/core/control_compat.c:203:14: sparse: warning: restricted snd_ctl_elem_type_t degrades to integer
sound/core/control_compat.c:205:14: sparse: warning: restricted snd_ctl_elem_type_t degrades to integer
sound/core/control_compat.c:207:14: sparse: warning: restricted snd_ctl_elem_type_t degrades to integer
sound/core/control_compat.c:209:14: sparse: warning: restricted snd_ctl_elem_type_t degrades to integer
sound/core/control_compat.c:237:21: sparse: warning: restricted snd_ctl_elem_type_t degrades to integer
sound/core/control_compat.c:238:21: sparse: warning: restricted snd_ctl_elem_type_t degrades to integer
sound/core/control_compat.c:270:21: sparse: warning: restricted snd_ctl_elem_type_t degrades to integer
sound/core/control_compat.c:271:21: sparse: warning: restricted snd_ctl_elem_type_t degrades to integer

Signed-off-by: Min-Hua Chen <minhuadotchen@...il.com>
---
 sound/core/control_compat.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/sound/core/control_compat.c b/sound/core/control_compat.c
index d8a86d1a99d6..9cae5d74335c 100644
--- a/sound/core/control_compat.c
+++ b/sound/core/control_compat.c
@@ -197,7 +197,7 @@ static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
 	return err;
 }
 
-static int get_elem_size(int type, int count)
+static int get_elem_size(snd_ctl_elem_type_t type, int count)
 {
 	switch (type) {
 	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
@@ -234,8 +234,8 @@ static int copy_ctl_value_from_user(struct snd_card *card,
 	if (type < 0)
 		return type;
 
-	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
-	    type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
+	if (type == (__force int)SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
+	    type == (__force int)SNDRV_CTL_ELEM_TYPE_INTEGER) {
 		for (i = 0; i < count; i++) {
 			s32 __user *intp = valuep;
 			int val;
@@ -244,7 +244,7 @@ static int copy_ctl_value_from_user(struct snd_card *card,
 			data->value.integer.value[i] = val;
 		}
 	} else {
-		size = get_elem_size(type, count);
+		size = get_elem_size((__force snd_ctl_elem_type_t)type, count);
 		if (size < 0) {
 			dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
 			return -EINVAL;
@@ -267,8 +267,8 @@ static int copy_ctl_value_to_user(void __user *userdata,
 	struct snd_ctl_elem_value32 __user *data32 = userdata;
 	int i, size;
 
-	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
-	    type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
+	if (type == (__force int)SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
+	    type == (__force int)SNDRV_CTL_ELEM_TYPE_INTEGER) {
 		for (i = 0; i < count; i++) {
 			s32 __user *intp = valuep;
 			int val;
@@ -277,7 +277,7 @@ static int copy_ctl_value_to_user(void __user *userdata,
 				return -EFAULT;
 		}
 	} else {
-		size = get_elem_size(type, count);
+		size = get_elem_size((__force snd_ctl_elem_type_t)type, count);
 		if (copy_to_user(valuep, data->value.bytes.data, size))
 			return -EFAULT;
 	}
-- 
2.34.1