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>

1 files changed, 37 insertions, 74 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index c0edac80df34..7b582112e3fc 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -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);
-
-        kfree(buf);
+        return 0;
+}
 
-        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);
-
-        kfree(buf);
+        return 0;
+}
 
-        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);
-
-        kfree(buf);
+        return 0;
+}
 
-        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);