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ASoC: use seq_file to dump the contents of dai_list,platform_list and codec_list 

Now the debugfs files dais/platforms/codecs have a size limit PAGE_SIZE and
the user can not see the whole contents of dai_list/platform_list/codec_list
when they are larger than this limit.

This patch uses seq_file instead to make sure dais/platforms/codecs show the
full contents of dai_list/platform_list/codec_list.

Signed-off-by: Donglin Peng <dolinux.peng@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Donglin Peng 2018-01-18 13:31:26 +08:00 committed by Mark Brown
parent 4fbd8d194f
commit 700c17ca89
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 37 additions and 74 deletions
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111
sound/soc/soc-core.c
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@ -349,120 +349,84 @@ static void soc_init_codec_debugfs(struct snd_soc_component *component)
"ASoC: Failed to create codec register debugfs file\n");
}
static ssize_t codec_list_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
static int codec_list_seq_show(struct seq_file *m, void *v)
{
char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
ssize_t len, ret = 0;
struct snd_soc_codec *codec;
if (!buf)
return -ENOMEM;
mutex_lock(&client_mutex);
list_for_each_entry(codec, &codec_list, list) {
len = snprintf(buf + ret, PAGE_SIZE - ret, "%s\n",
codec->component.name);
if (len >= 0)
ret += len;
if (ret > PAGE_SIZE) {
ret = PAGE_SIZE;
break;
}
}
list_for_each_entry(codec, &codec_list, list)
seq_printf(m, "%s\n", codec->component.name);
mutex_unlock(&client_mutex);
if (ret >= 0)
ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
return 0;
}
kfree(buf);
return ret;
static int codec_list_seq_open(struct inode *inode, struct file *file)
{
return single_open(file, codec_list_seq_show, NULL);
}
static const struct file_operations codec_list_fops = {
.read = codec_list_read_file,
.llseek = default_llseek,/* read accesses f_pos */
.open = codec_list_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static ssize_t dai_list_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
static int dai_list_seq_show(struct seq_file *m, void *v)
{
char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
ssize_t len, ret = 0;
struct snd_soc_component *component;
struct snd_soc_dai *dai;
if (!buf)
return -ENOMEM;
mutex_lock(&client_mutex);
list_for_each_entry(component, &component_list, list) {
list_for_each_entry(dai, &component->dai_list, list) {
len = snprintf(buf + ret, PAGE_SIZE - ret, "%s\n",
dai->name);
if (len >= 0)
ret += len;
if (ret > PAGE_SIZE) {
ret = PAGE_SIZE;
break;
}
}
}
list_for_each_entry(component, &component_list, list)
list_for_each_entry(dai, &component->dai_list, list)
seq_printf(m, "%s\n", dai->name);
mutex_unlock(&client_mutex);
ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
return 0;
}
kfree(buf);
return ret;
static int dai_list_seq_open(struct inode *inode, struct file *file)
{
return single_open(file, dai_list_seq_show, NULL);
}
static const struct file_operations dai_list_fops = {
.read = dai_list_read_file,
.llseek = default_llseek,/* read accesses f_pos */
.open = dai_list_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static ssize_t platform_list_read_file(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
static int platform_list_seq_show(struct seq_file *m, void *v)
{
char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
ssize_t len, ret = 0;
struct snd_soc_platform *platform;
if (!buf)
return -ENOMEM;
mutex_lock(&client_mutex);
list_for_each_entry(platform, &platform_list, list) {
len = snprintf(buf + ret, PAGE_SIZE - ret, "%s\n",
platform->component.name);
if (len >= 0)
ret += len;
if (ret > PAGE_SIZE) {
ret = PAGE_SIZE;
break;
}
}
list_for_each_entry(platform, &platform_list, list)
seq_printf(m, "%s\n", platform->component.name);
mutex_unlock(&client_mutex);
ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
return 0;
}
kfree(buf);
return ret;
static int platform_list_seq_open(struct inode *inode, struct file *file)
{
return single_open(file, platform_list_seq_show, NULL);
}
static const struct file_operations platform_list_fops = {
.read = platform_list_read_file,
.llseek = default_llseek,/* read accesses f_pos */
.open = platform_list_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void soc_init_card_debugfs(struct snd_soc_card *card)
@ -491,7 +455,6 @@ static void soc_cleanup_card_debugfs(struct snd_soc_card *card)
debugfs_remove_recursive(card->debugfs_card_root);
}
static void snd_soc_debugfs_init(void)
{
snd_soc_debugfs_root = debugfs_create_dir("asoc", NULL);