From 4b72362b1228d9aad684e4fcaa422d9562066fe1 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Tue, 27 Feb 2024 09:52:48 +0100 Subject: 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 Link: https://lore.kernel.org/r/20240227085306.9764-7-tiwai@suse.de --- sound/core/info.c | 93 +++++++++++++++++---------------------------------- sound/core/info_oss.c | 10 ++---- 2 files changed, 33 insertions(+), 70 deletions(-) (limited to 'sound') diff --git a/sound/core/info.c b/sound/core/info.c index e2f302e55bbb2..1f5b8a3d9e3b6 100644 --- a/sound/core/info.c +++ b/sound/core/info.c @@ -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; } diff --git a/sound/core/info_oss.c b/sound/core/info_oss.c index ebc714b2f46b3..0dbbb80055700 100644 --- a/sound/core/info_oss.c +++ b/sound/core/info_oss.c @@ -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; -- cgit 1.2.3-korg