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ALSA: info: Use guard() for locking

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We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.

Only the code refactoring, and no functional changes.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20240227085306.9764-7-tiwai@suse.de
This commit is contained in:
Takashi Iwai 2024-02-27 09:52:48 +01:00
parent e6684d08cc
commit 4b72362b12
2 changed files with 33 additions and 70 deletions
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93
sound/core/info.c
View File

@ -105,17 +105,15 @@ static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
{
struct snd_info_private_data *data;
struct snd_info_entry *entry;
loff_t ret = -EINVAL, size;
loff_t size;
data = file->private_data;
entry = data->entry;
mutex_lock(&entry->access);
if (entry->c.ops->llseek) {
ret = entry->c.ops->llseek(entry,
data->file_private_data,
file, offset, orig);
goto out;
}
guard(mutex)(&entry->access);
if (entry->c.ops->llseek)
return entry->c.ops->llseek(entry,
data->file_private_data,
file, offset, orig);
size = entry->size;
switch (orig) {
@ -126,21 +124,18 @@ static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
break;
case SEEK_END:
if (!size)
goto out;
return -EINVAL;
offset += size;
break;
default:
goto out;
return -EINVAL;
}
if (offset < 0)
goto out;
return -EINVAL;
if (size && offset > size)
offset = size;
file->f_pos = offset;
ret = offset;
out:
mutex_unlock(&entry->access);
return ret;
return offset;
}
static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
@ -238,10 +233,10 @@ static int snd_info_entry_open(struct inode *inode, struct file *file)
struct snd_info_private_data *data;
int mode, err;
mutex_lock(&info_mutex);
guard(mutex)(&info_mutex);
err = alloc_info_private(entry, &data);
if (err < 0)
goto unlock;
return err;
mode = file->f_flags & O_ACCMODE;
if (((mode == O_RDONLY || mode == O_RDWR) && !entry->c.ops->read) ||
@ -257,14 +252,11 @@ static int snd_info_entry_open(struct inode *inode, struct file *file)
}
file->private_data = data;
mutex_unlock(&info_mutex);
return 0;
error:
kfree(data);
module_put(entry->module);
unlock:
mutex_unlock(&info_mutex);
return err;
}
@ -306,7 +298,6 @@ static ssize_t snd_info_text_entry_write(struct file *file,
struct snd_info_buffer *buf;
loff_t pos;
size_t next;
int err = 0;
if (!entry->c.text.write)
return -EIO;
@ -317,34 +308,24 @@ static ssize_t snd_info_text_entry_write(struct file *file,
/* don't handle too large text inputs */
if (next > 16 * 1024)
return -EIO;
mutex_lock(&entry->access);
guard(mutex)(&entry->access);
buf = data->wbuffer;
if (!buf) {
data->wbuffer = buf = kzalloc(sizeof(*buf), GFP_KERNEL);
if (!buf) {
err = -ENOMEM;
goto error;
}
if (!buf)
return -ENOMEM;
}
if (next > buf->len) {
char *nbuf = kvzalloc(PAGE_ALIGN(next), GFP_KERNEL);
if (!nbuf) {
err = -ENOMEM;
goto error;
}
if (!nbuf)
return -ENOMEM;
kvfree(buf->buffer);
buf->buffer = nbuf;
buf->len = PAGE_ALIGN(next);
}
if (copy_from_user(buf->buffer + pos, buffer, count)) {
err = -EFAULT;
goto error;
}
if (copy_from_user(buf->buffer + pos, buffer, count))
return -EFAULT;
buf->size = next;
error:
mutex_unlock(&entry->access);
if (err < 0)
return err;
*offset = next;
return count;
}
@ -369,10 +350,10 @@ static int snd_info_text_entry_open(struct inode *inode, struct file *file)
struct snd_info_private_data *data;
int err;
mutex_lock(&info_mutex);
guard(mutex)(&info_mutex);
err = alloc_info_private(entry, &data);
if (err < 0)
goto unlock;
return err;
data->rbuffer = kzalloc(sizeof(*data->rbuffer), GFP_KERNEL);
if (!data->rbuffer) {
@ -386,15 +367,12 @@ static int snd_info_text_entry_open(struct inode *inode, struct file *file)
err = single_open(file, snd_info_seq_show, data);
if (err < 0)
goto error;
mutex_unlock(&info_mutex);
return 0;
error:
kfree(data->rbuffer);
kfree(data);
module_put(entry->module);
unlock:
mutex_unlock(&info_mutex);
return err;
}
@ -549,7 +527,7 @@ int snd_info_card_register(struct snd_card *card)
*/
void snd_info_card_id_change(struct snd_card *card)
{
mutex_lock(&info_mutex);
guard(mutex)(&info_mutex);
if (card->proc_root_link) {
proc_remove(card->proc_root_link);
card->proc_root_link = NULL;
@ -558,7 +536,6 @@ void snd_info_card_id_change(struct snd_card *card)
card->proc_root_link = proc_symlink(card->id,
snd_proc_root->p,
card->proc_root->name);
mutex_unlock(&info_mutex);
}
/*
@ -574,12 +551,11 @@ void snd_info_card_disconnect(struct snd_card *card)
if (card->proc_root)
proc_remove(card->proc_root->p);
mutex_lock(&info_mutex);
guard(mutex)(&info_mutex);
if (card->proc_root)
snd_info_clear_entries(card->proc_root);
card->proc_root_link = NULL;
card->proc_root = NULL;
mutex_unlock(&info_mutex);
}
/*
@ -703,9 +679,8 @@ snd_info_create_entry(const char *name, struct snd_info_entry *parent,
entry->parent = parent;
entry->module = module;
if (parent) {
mutex_lock(&parent->access);
guard(mutex)(&parent->access);
list_add_tail(&entry->list, &parent->children);
mutex_unlock(&parent->access);
}
return entry;
}
@ -775,9 +750,8 @@ void snd_info_free_entry(struct snd_info_entry * entry)
return;
if (entry->p) {
proc_remove(entry->p);
mutex_lock(&info_mutex);
guard(mutex)(&info_mutex);
snd_info_clear_entries(entry);
mutex_unlock(&info_mutex);
}
/* free all children at first */
@ -786,9 +760,8 @@ void snd_info_free_entry(struct snd_info_entry * entry)
p = entry->parent;
if (p) {
mutex_lock(&p->access);
guard(mutex)(&p->access);
list_del(&entry->list);
mutex_unlock(&p->access);
}
kfree(entry->name);
if (entry->private_free)
@ -804,15 +777,13 @@ static int __snd_info_register(struct snd_info_entry *entry)
if (snd_BUG_ON(!entry))
return -ENXIO;
root = entry->parent == NULL ? snd_proc_root->p : entry->parent->p;
mutex_lock(&info_mutex);
guard(mutex)(&info_mutex);
if (entry->p || !root)
goto unlock;
return 0;
if (S_ISDIR(entry->mode)) {
p = proc_mkdir_mode(entry->name, entry->mode, root);
if (!p) {
mutex_unlock(&info_mutex);
if (!p)
return -ENOMEM;
}
} else {
const struct proc_ops *ops;
if (entry->content == SNDRV_INFO_CONTENT_DATA)
@ -821,15 +792,11 @@ static int __snd_info_register(struct snd_info_entry *entry)
ops = &snd_info_text_entry_ops;
p = proc_create_data(entry->name, entry->mode, root,
ops, entry);
if (!p) {
mutex_unlock(&info_mutex);
if (!p)
return -ENOMEM;
}
proc_set_size(p, entry->size);
}
entry->p = p;
unlock:
mutex_unlock(&info_mutex);
return 0;
}

10
sound/core/info_oss.c
View File

@ -29,20 +29,17 @@ int snd_oss_info_register(int dev, int num, char *string)
return -ENXIO;
if (snd_BUG_ON(num < 0 || num >= SNDRV_CARDS))
return -ENXIO;
mutex_lock(&strings);
guard(mutex)(&strings);
if (string == NULL) {
x = snd_sndstat_strings[num][dev];
kfree(x);
x = NULL;
} else {
x = kstrdup(string, GFP_KERNEL);
if (x == NULL) {
mutex_unlock(&strings);
if (x == NULL)
return -ENOMEM;
}
}
snd_sndstat_strings[num][dev] = x;
mutex_unlock(&strings);
return 0;
}
EXPORT_SYMBOL(snd_oss_info_register);
@ -53,7 +50,7 @@ static int snd_sndstat_show_strings(struct snd_info_buffer *buf, char *id, int d
char *str;
snd_iprintf(buf, "\n%s:", id);
mutex_lock(&strings);
guard(mutex)(&strings);
for (idx = 0; idx < SNDRV_CARDS; idx++) {
str = snd_sndstat_strings[idx][dev];
if (str) {
@ -64,7 +61,6 @@ static int snd_sndstat_show_strings(struct snd_info_buffer *buf, char *id, int d
snd_iprintf(buf, "%i: %s\n", idx, str);
}
}
mutex_unlock(&strings);
if (ok < 0)
snd_iprintf(buf, " NOT ENABLED IN CONFIG\n");
return ok;