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471be437be
We can simplify the code gracefully with new guard() macro and co for automatic cleanup of locks. The lops calls under multiple rwsems are factored out as a simple macro, so that it can be called easily from snd_ctl_dev_register() and snd_ctl_dev_disconnect(). There are a few remaining explicit rwsem and spinlock calls, and those are the places where the lock downgrade happens or where the temporary unlock/relocking happens -- which guard() doens't cover well yet. Only the code refactoring, and no functional changes. Signed-off-by: Takashi Iwai <tiwai@suse.de> Link: https://lore.kernel.org/r/20240227085306.9764-9-tiwai@suse.de
459 lines
12 KiB
C
459 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* compat ioctls for control API
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*
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* Copyright (c) by Takashi Iwai <tiwai@suse.de>
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*/
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/* this file included from control.c */
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#include <linux/compat.h>
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#include <linux/slab.h>
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struct snd_ctl_elem_list32 {
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u32 offset;
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u32 space;
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u32 used;
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u32 count;
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u32 pids;
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unsigned char reserved[50];
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} /* don't set packed attribute here */;
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static int snd_ctl_elem_list_compat(struct snd_card *card,
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struct snd_ctl_elem_list32 __user *data32)
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{
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struct snd_ctl_elem_list data = {};
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compat_caddr_t ptr;
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int err;
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/* offset, space, used, count */
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if (copy_from_user(&data, data32, 4 * sizeof(u32)))
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return -EFAULT;
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/* pids */
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if (get_user(ptr, &data32->pids))
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return -EFAULT;
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data.pids = compat_ptr(ptr);
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err = snd_ctl_elem_list(card, &data);
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if (err < 0)
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return err;
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/* copy the result */
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if (copy_to_user(data32, &data, 4 * sizeof(u32)))
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return -EFAULT;
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return 0;
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}
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/*
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* control element info
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* it uses union, so the things are not easy..
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*/
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struct snd_ctl_elem_info32 {
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struct snd_ctl_elem_id id; // the size of struct is same
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s32 type;
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u32 access;
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u32 count;
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s32 owner;
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union {
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struct {
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s32 min;
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s32 max;
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s32 step;
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} integer;
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struct {
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u64 min;
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u64 max;
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u64 step;
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} integer64;
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struct {
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u32 items;
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u32 item;
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char name[64];
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u64 names_ptr;
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u32 names_length;
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} enumerated;
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unsigned char reserved[128];
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} value;
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unsigned char reserved[64];
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} __packed;
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static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
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struct snd_ctl_elem_info32 __user *data32)
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{
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struct snd_ctl_elem_info *data __free(kfree) = NULL;
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int err;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (! data)
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return -ENOMEM;
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/* copy id */
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if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
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return -EFAULT;
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/* we need to copy the item index.
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* hope this doesn't break anything..
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*/
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if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
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return -EFAULT;
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err = snd_ctl_elem_info(ctl, data);
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if (err < 0)
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return err;
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/* restore info to 32bit */
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/* id, type, access, count */
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if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) ||
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copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
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return -EFAULT;
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if (put_user(data->owner, &data32->owner))
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return -EFAULT;
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switch (data->type) {
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case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
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case SNDRV_CTL_ELEM_TYPE_INTEGER:
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if (put_user(data->value.integer.min, &data32->value.integer.min) ||
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put_user(data->value.integer.max, &data32->value.integer.max) ||
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put_user(data->value.integer.step, &data32->value.integer.step))
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return -EFAULT;
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break;
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case SNDRV_CTL_ELEM_TYPE_INTEGER64:
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if (copy_to_user(&data32->value.integer64,
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&data->value.integer64,
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sizeof(data->value.integer64)))
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return -EFAULT;
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break;
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case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
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if (copy_to_user(&data32->value.enumerated,
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&data->value.enumerated,
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sizeof(data->value.enumerated)))
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return -EFAULT;
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break;
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default:
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break;
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}
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return 0;
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}
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/* read / write */
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struct snd_ctl_elem_value32 {
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struct snd_ctl_elem_id id;
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unsigned int indirect; /* bit-field causes misalignment */
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union {
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s32 integer[128];
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unsigned char data[512];
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#ifndef CONFIG_X86_64
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s64 integer64[64];
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#endif
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} value;
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unsigned char reserved[128];
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};
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#ifdef CONFIG_X86_X32_ABI
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/* x32 has a different alignment for 64bit values from ia32 */
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struct snd_ctl_elem_value_x32 {
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struct snd_ctl_elem_id id;
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unsigned int indirect; /* bit-field causes misalignment */
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union {
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s32 integer[128];
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unsigned char data[512];
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s64 integer64[64];
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} value;
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unsigned char reserved[128];
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};
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#endif /* CONFIG_X86_X32_ABI */
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/* get the value type and count of the control */
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static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
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int *countp)
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{
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struct snd_kcontrol *kctl;
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struct snd_ctl_elem_info *info __free(kfree) = NULL;
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int err;
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guard(rwsem_read)(&card->controls_rwsem);
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kctl = snd_ctl_find_id_locked(card, id);
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if (!kctl)
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return -ENOENT;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (info == NULL)
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return -ENOMEM;
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info->id = *id;
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err = snd_power_ref_and_wait(card);
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if (!err)
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err = kctl->info(kctl, info);
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snd_power_unref(card);
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if (err >= 0) {
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err = info->type;
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*countp = info->count;
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}
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return err;
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}
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static int get_elem_size(snd_ctl_elem_type_t type, int count)
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{
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switch (type) {
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case SNDRV_CTL_ELEM_TYPE_INTEGER64:
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return sizeof(s64) * count;
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case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
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return sizeof(int) * count;
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case SNDRV_CTL_ELEM_TYPE_BYTES:
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return 512;
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case SNDRV_CTL_ELEM_TYPE_IEC958:
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return sizeof(struct snd_aes_iec958);
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default:
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return -1;
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}
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}
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static int copy_ctl_value_from_user(struct snd_card *card,
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struct snd_ctl_elem_value *data,
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void __user *userdata,
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void __user *valuep,
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int *typep, int *countp)
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{
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struct snd_ctl_elem_value32 __user *data32 = userdata;
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int i, type, size;
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int count;
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unsigned int indirect;
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if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
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return -EFAULT;
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if (get_user(indirect, &data32->indirect))
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return -EFAULT;
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if (indirect)
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return -EINVAL;
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type = get_ctl_type(card, &data->id, &count);
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if (type < 0)
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return type;
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if (type == (__force int)SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
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type == (__force int)SNDRV_CTL_ELEM_TYPE_INTEGER) {
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for (i = 0; i < count; i++) {
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s32 __user *intp = valuep;
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int val;
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if (get_user(val, &intp[i]))
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return -EFAULT;
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data->value.integer.value[i] = val;
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}
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} else {
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size = get_elem_size((__force snd_ctl_elem_type_t)type, count);
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if (size < 0) {
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dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
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return -EINVAL;
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}
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if (copy_from_user(data->value.bytes.data, valuep, size))
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return -EFAULT;
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}
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*typep = type;
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*countp = count;
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return 0;
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}
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/* restore the value to 32bit */
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static int copy_ctl_value_to_user(void __user *userdata,
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void __user *valuep,
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struct snd_ctl_elem_value *data,
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int type, int count)
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{
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struct snd_ctl_elem_value32 __user *data32 = userdata;
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int i, size;
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if (type == (__force int)SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
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type == (__force int)SNDRV_CTL_ELEM_TYPE_INTEGER) {
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for (i = 0; i < count; i++) {
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s32 __user *intp = valuep;
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int val;
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val = data->value.integer.value[i];
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if (put_user(val, &intp[i]))
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return -EFAULT;
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}
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} else {
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size = get_elem_size((__force snd_ctl_elem_type_t)type, count);
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if (copy_to_user(valuep, data->value.bytes.data, size))
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return -EFAULT;
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}
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if (copy_to_user(&data32->id, &data->id, sizeof(data32->id)))
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return -EFAULT;
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return 0;
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}
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static int ctl_elem_read_user(struct snd_card *card,
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void __user *userdata, void __user *valuep)
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{
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struct snd_ctl_elem_value *data __free(kfree) = NULL;
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int err, type, count;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (data == NULL)
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return -ENOMEM;
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err = copy_ctl_value_from_user(card, data, userdata, valuep,
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&type, &count);
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if (err < 0)
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return err;
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err = snd_ctl_elem_read(card, data);
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if (err < 0)
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return err;
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return copy_ctl_value_to_user(userdata, valuep, data, type, count);
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}
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static int ctl_elem_write_user(struct snd_ctl_file *file,
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void __user *userdata, void __user *valuep)
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{
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struct snd_ctl_elem_value *data __free(kfree) = NULL;
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struct snd_card *card = file->card;
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int err, type, count;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (data == NULL)
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return -ENOMEM;
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err = copy_ctl_value_from_user(card, data, userdata, valuep,
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&type, &count);
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if (err < 0)
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return err;
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err = snd_ctl_elem_write(card, file, data);
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if (err < 0)
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return err;
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return copy_ctl_value_to_user(userdata, valuep, data, type, count);
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}
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static int snd_ctl_elem_read_user_compat(struct snd_card *card,
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struct snd_ctl_elem_value32 __user *data32)
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{
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return ctl_elem_read_user(card, data32, &data32->value);
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}
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static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
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struct snd_ctl_elem_value32 __user *data32)
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{
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return ctl_elem_write_user(file, data32, &data32->value);
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}
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#ifdef CONFIG_X86_X32_ABI
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static int snd_ctl_elem_read_user_x32(struct snd_card *card,
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struct snd_ctl_elem_value_x32 __user *data32)
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{
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return ctl_elem_read_user(card, data32, &data32->value);
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}
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static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
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struct snd_ctl_elem_value_x32 __user *data32)
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{
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return ctl_elem_write_user(file, data32, &data32->value);
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}
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#endif /* CONFIG_X86_X32_ABI */
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/* add or replace a user control */
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static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
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struct snd_ctl_elem_info32 __user *data32,
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int replace)
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{
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struct snd_ctl_elem_info *data __free(kfree) = NULL;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (! data)
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return -ENOMEM;
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/* id, type, access, count */ \
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if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
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copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
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return -EFAULT;
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if (get_user(data->owner, &data32->owner))
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return -EFAULT;
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switch (data->type) {
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case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
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case SNDRV_CTL_ELEM_TYPE_INTEGER:
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if (get_user(data->value.integer.min, &data32->value.integer.min) ||
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get_user(data->value.integer.max, &data32->value.integer.max) ||
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get_user(data->value.integer.step, &data32->value.integer.step))
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return -EFAULT;
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break;
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case SNDRV_CTL_ELEM_TYPE_INTEGER64:
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if (copy_from_user(&data->value.integer64,
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&data32->value.integer64,
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sizeof(data->value.integer64)))
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return -EFAULT;
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break;
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case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
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if (copy_from_user(&data->value.enumerated,
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&data32->value.enumerated,
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sizeof(data->value.enumerated)))
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return -EFAULT;
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data->value.enumerated.names_ptr =
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(uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
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break;
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default:
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break;
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}
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return snd_ctl_elem_add(file, data, replace);
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}
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enum {
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SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
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SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
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SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
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SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
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SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
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SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
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#ifdef CONFIG_X86_X32_ABI
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SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
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SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
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#endif /* CONFIG_X86_X32_ABI */
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};
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static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct snd_ctl_file *ctl;
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struct snd_kctl_ioctl *p;
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void __user *argp = compat_ptr(arg);
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int err;
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ctl = file->private_data;
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if (snd_BUG_ON(!ctl || !ctl->card))
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return -ENXIO;
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switch (cmd) {
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case SNDRV_CTL_IOCTL_PVERSION:
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case SNDRV_CTL_IOCTL_CARD_INFO:
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case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
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case SNDRV_CTL_IOCTL_POWER:
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case SNDRV_CTL_IOCTL_POWER_STATE:
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case SNDRV_CTL_IOCTL_ELEM_LOCK:
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case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
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case SNDRV_CTL_IOCTL_ELEM_REMOVE:
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case SNDRV_CTL_IOCTL_TLV_READ:
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case SNDRV_CTL_IOCTL_TLV_WRITE:
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case SNDRV_CTL_IOCTL_TLV_COMMAND:
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return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
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case SNDRV_CTL_IOCTL_ELEM_LIST32:
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return snd_ctl_elem_list_compat(ctl->card, argp);
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case SNDRV_CTL_IOCTL_ELEM_INFO32:
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return snd_ctl_elem_info_compat(ctl, argp);
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case SNDRV_CTL_IOCTL_ELEM_READ32:
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return snd_ctl_elem_read_user_compat(ctl->card, argp);
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case SNDRV_CTL_IOCTL_ELEM_WRITE32:
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return snd_ctl_elem_write_user_compat(ctl, argp);
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case SNDRV_CTL_IOCTL_ELEM_ADD32:
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return snd_ctl_elem_add_compat(ctl, argp, 0);
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case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
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return snd_ctl_elem_add_compat(ctl, argp, 1);
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#ifdef CONFIG_X86_X32_ABI
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case SNDRV_CTL_IOCTL_ELEM_READ_X32:
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return snd_ctl_elem_read_user_x32(ctl->card, argp);
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case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
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return snd_ctl_elem_write_user_x32(ctl, argp);
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#endif /* CONFIG_X86_X32_ABI */
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}
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guard(rwsem_read)(&snd_ioctl_rwsem);
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list_for_each_entry(p, &snd_control_compat_ioctls, list) {
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if (p->fioctl) {
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err = p->fioctl(ctl->card, ctl, cmd, arg);
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if (err != -ENOIOCTLCMD)
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return err;
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}
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}
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return -ENOIOCTLCMD;
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}
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