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ALSA: info: Use guard() for locking
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
parent
e6684d08cc
commit
4b72362b12
@ -105,17 +105,15 @@ static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
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{
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struct snd_info_private_data *data;
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struct snd_info_entry *entry;
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loff_t ret = -EINVAL, size;
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loff_t size;
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data = file->private_data;
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entry = data->entry;
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mutex_lock(&entry->access);
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if (entry->c.ops->llseek) {
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ret = entry->c.ops->llseek(entry,
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data->file_private_data,
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file, offset, orig);
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goto out;
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}
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guard(mutex)(&entry->access);
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if (entry->c.ops->llseek)
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return entry->c.ops->llseek(entry,
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data->file_private_data,
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file, offset, orig);
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size = entry->size;
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switch (orig) {
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@ -126,21 +124,18 @@ static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
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break;
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case SEEK_END:
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if (!size)
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goto out;
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return -EINVAL;
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offset += size;
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break;
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default:
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goto out;
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return -EINVAL;
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}
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if (offset < 0)
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goto out;
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return -EINVAL;
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if (size && offset > size)
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offset = size;
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file->f_pos = offset;
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ret = offset;
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out:
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mutex_unlock(&entry->access);
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return ret;
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return offset;
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}
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static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
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@ -238,10 +233,10 @@ static int snd_info_entry_open(struct inode *inode, struct file *file)
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struct snd_info_private_data *data;
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int mode, err;
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mutex_lock(&info_mutex);
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guard(mutex)(&info_mutex);
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err = alloc_info_private(entry, &data);
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if (err < 0)
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goto unlock;
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return err;
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mode = file->f_flags & O_ACCMODE;
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if (((mode == O_RDONLY || mode == O_RDWR) && !entry->c.ops->read) ||
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@ -257,14 +252,11 @@ static int snd_info_entry_open(struct inode *inode, struct file *file)
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}
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file->private_data = data;
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mutex_unlock(&info_mutex);
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return 0;
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error:
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kfree(data);
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module_put(entry->module);
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unlock:
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mutex_unlock(&info_mutex);
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return err;
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}
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@ -306,7 +298,6 @@ static ssize_t snd_info_text_entry_write(struct file *file,
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struct snd_info_buffer *buf;
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loff_t pos;
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size_t next;
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int err = 0;
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if (!entry->c.text.write)
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return -EIO;
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@ -317,34 +308,24 @@ static ssize_t snd_info_text_entry_write(struct file *file,
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/* don't handle too large text inputs */
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if (next > 16 * 1024)
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return -EIO;
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mutex_lock(&entry->access);
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guard(mutex)(&entry->access);
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buf = data->wbuffer;
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if (!buf) {
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data->wbuffer = buf = kzalloc(sizeof(*buf), GFP_KERNEL);
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if (!buf) {
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err = -ENOMEM;
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goto error;
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}
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if (!buf)
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return -ENOMEM;
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}
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if (next > buf->len) {
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char *nbuf = kvzalloc(PAGE_ALIGN(next), GFP_KERNEL);
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if (!nbuf) {
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err = -ENOMEM;
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goto error;
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}
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if (!nbuf)
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return -ENOMEM;
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kvfree(buf->buffer);
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buf->buffer = nbuf;
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buf->len = PAGE_ALIGN(next);
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}
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if (copy_from_user(buf->buffer + pos, buffer, count)) {
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err = -EFAULT;
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goto error;
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}
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if (copy_from_user(buf->buffer + pos, buffer, count))
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return -EFAULT;
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buf->size = next;
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error:
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mutex_unlock(&entry->access);
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if (err < 0)
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return err;
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*offset = next;
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return count;
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}
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@ -369,10 +350,10 @@ static int snd_info_text_entry_open(struct inode *inode, struct file *file)
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struct snd_info_private_data *data;
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int err;
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mutex_lock(&info_mutex);
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guard(mutex)(&info_mutex);
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err = alloc_info_private(entry, &data);
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if (err < 0)
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goto unlock;
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return err;
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data->rbuffer = kzalloc(sizeof(*data->rbuffer), GFP_KERNEL);
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if (!data->rbuffer) {
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@ -386,15 +367,12 @@ static int snd_info_text_entry_open(struct inode *inode, struct file *file)
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err = single_open(file, snd_info_seq_show, data);
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if (err < 0)
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goto error;
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mutex_unlock(&info_mutex);
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return 0;
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error:
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kfree(data->rbuffer);
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kfree(data);
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module_put(entry->module);
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unlock:
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mutex_unlock(&info_mutex);
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return err;
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}
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@ -549,7 +527,7 @@ int snd_info_card_register(struct snd_card *card)
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*/
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void snd_info_card_id_change(struct snd_card *card)
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{
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mutex_lock(&info_mutex);
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guard(mutex)(&info_mutex);
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if (card->proc_root_link) {
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proc_remove(card->proc_root_link);
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card->proc_root_link = NULL;
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@ -558,7 +536,6 @@ void snd_info_card_id_change(struct snd_card *card)
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card->proc_root_link = proc_symlink(card->id,
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snd_proc_root->p,
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card->proc_root->name);
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mutex_unlock(&info_mutex);
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}
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/*
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@ -574,12 +551,11 @@ void snd_info_card_disconnect(struct snd_card *card)
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if (card->proc_root)
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proc_remove(card->proc_root->p);
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mutex_lock(&info_mutex);
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guard(mutex)(&info_mutex);
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if (card->proc_root)
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snd_info_clear_entries(card->proc_root);
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card->proc_root_link = NULL;
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card->proc_root = NULL;
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mutex_unlock(&info_mutex);
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}
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/*
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@ -703,9 +679,8 @@ snd_info_create_entry(const char *name, struct snd_info_entry *parent,
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entry->parent = parent;
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entry->module = module;
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if (parent) {
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mutex_lock(&parent->access);
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guard(mutex)(&parent->access);
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list_add_tail(&entry->list, &parent->children);
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mutex_unlock(&parent->access);
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}
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return entry;
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}
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@ -775,9 +750,8 @@ void snd_info_free_entry(struct snd_info_entry * entry)
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return;
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if (entry->p) {
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proc_remove(entry->p);
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mutex_lock(&info_mutex);
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guard(mutex)(&info_mutex);
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snd_info_clear_entries(entry);
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mutex_unlock(&info_mutex);
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}
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/* free all children at first */
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@ -786,9 +760,8 @@ void snd_info_free_entry(struct snd_info_entry * entry)
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p = entry->parent;
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if (p) {
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mutex_lock(&p->access);
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guard(mutex)(&p->access);
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list_del(&entry->list);
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mutex_unlock(&p->access);
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}
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kfree(entry->name);
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if (entry->private_free)
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@ -804,15 +777,13 @@ static int __snd_info_register(struct snd_info_entry *entry)
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if (snd_BUG_ON(!entry))
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return -ENXIO;
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root = entry->parent == NULL ? snd_proc_root->p : entry->parent->p;
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mutex_lock(&info_mutex);
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guard(mutex)(&info_mutex);
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if (entry->p || !root)
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goto unlock;
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return 0;
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if (S_ISDIR(entry->mode)) {
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p = proc_mkdir_mode(entry->name, entry->mode, root);
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if (!p) {
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mutex_unlock(&info_mutex);
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if (!p)
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return -ENOMEM;
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}
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} else {
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const struct proc_ops *ops;
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if (entry->content == SNDRV_INFO_CONTENT_DATA)
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@ -821,15 +792,11 @@ static int __snd_info_register(struct snd_info_entry *entry)
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ops = &snd_info_text_entry_ops;
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p = proc_create_data(entry->name, entry->mode, root,
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ops, entry);
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if (!p) {
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mutex_unlock(&info_mutex);
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if (!p)
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return -ENOMEM;
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}
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proc_set_size(p, entry->size);
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}
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entry->p = p;
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unlock:
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mutex_unlock(&info_mutex);
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return 0;
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}
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@ -29,20 +29,17 @@ int snd_oss_info_register(int dev, int num, char *string)
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return -ENXIO;
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if (snd_BUG_ON(num < 0 || num >= SNDRV_CARDS))
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return -ENXIO;
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mutex_lock(&strings);
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guard(mutex)(&strings);
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if (string == NULL) {
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x = snd_sndstat_strings[num][dev];
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kfree(x);
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x = NULL;
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} else {
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x = kstrdup(string, GFP_KERNEL);
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if (x == NULL) {
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mutex_unlock(&strings);
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if (x == NULL)
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return -ENOMEM;
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}
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}
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snd_sndstat_strings[num][dev] = x;
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mutex_unlock(&strings);
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return 0;
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}
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EXPORT_SYMBOL(snd_oss_info_register);
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@ -53,7 +50,7 @@ static int snd_sndstat_show_strings(struct snd_info_buffer *buf, char *id, int d
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char *str;
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snd_iprintf(buf, "\n%s:", id);
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mutex_lock(&strings);
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guard(mutex)(&strings);
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for (idx = 0; idx < SNDRV_CARDS; idx++) {
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str = snd_sndstat_strings[idx][dev];
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if (str) {
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@ -64,7 +61,6 @@ static int snd_sndstat_show_strings(struct snd_info_buffer *buf, char *id, int d
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snd_iprintf(buf, "%i: %s\n", idx, str);
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}
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}
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mutex_unlock(&strings);
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if (ok < 0)
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snd_iprintf(buf, " NOT ENABLED IN CONFIG\n");
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return ok;
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