[alsa-devel] [PATCH v2] 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> --- Changelog v2 -fix commit log error sound/soc/soc-core.c | 111 +++++++++++++++++---------------------------------- 1 file 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); -- 2.15.1
On Thu, Jan 18, 2018 at 7:31 AM, Donglin Peng <dolinux.peng@gmail.com> wrote:
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.
If it's not critical, I would suggest to wait till v4.16-rc1, where I would like to push [1], and switch to DEFINE_SHOW_ATTRIBUTE() macro.
+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 = { + .open = codec_list_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, };
This will be just DEFINE_SHOW_ATTRIBUTE(codec_list_seq);
+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 = { + .open = dai_list_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, };
Ditto.
+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 = { + .open = platform_list_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, };
Ditto. [1]: https://patchwork.kernel.org/patch/10178813/ -- With Best Regards, Andy Shevchenko
On Tue, Jan 23, 2018 at 07:08:15PM +0200, Andy Shevchenko wrote:
If it's not critical, I would suggest to wait till v4.16-rc1, where I would like to push [1], and switch to DEFINE_SHOW_ATTRIBUTE() macro.
Too late, I already applied this - a further conversion for the new macro would be good.
On Wed, Jan 24, 2018 at 1:37 AM, Mark Brown <broonie@kernel.org> wrote:
On Tue, Jan 23, 2018 at 07:08:15PM +0200, Andy Shevchenko wrote:
If it's not critical, I would suggest to wait till v4.16-rc1, where I would like to push [1], and switch to DEFINE_SHOW_ATTRIBUTE() macro.
Too late, I already applied this - a further conversion for the new macro would be good. I can send another patch after the following patch is merged: https://patchwork.kernel.org/patch/10178813/
On Fri, Jan 26, 2018 at 03:16:00PM +0800, Donglin Peng wrote:
On Wed, Jan 24, 2018 at 1:37 AM, Mark Brown <broonie@kernel.org> wrote:
Too late, I already applied this - a further conversion for the new macro would be good.
I can send another patch after the following patch is merged: https://patchwork.kernel.org/patch/10178813/
Yes, please - that'd be great!
On Fri, Jan 26, 2018 at 1:28 PM, Mark Brown <broonie@kernel.org> wrote:
On Fri, Jan 26, 2018 at 03:16:00PM +0800, Donglin Peng wrote:
On Wed, Jan 24, 2018 at 1:37 AM, Mark Brown <broonie@kernel.org> wrote:
Too late, I already applied this - a further conversion for the new macro would be good.
I can send another patch after the following patch is merged: https://patchwork.kernel.org/patch/10178813/
Yes, please - that'd be great!
I have sent PR to Linus. If everything goes fine, it will be in upstream today evening. -- With Best Regards, Andy Shevchenko
On Fri, Jan 26, 2018 at 9:16 AM, Donglin Peng <dolinux.peng@gmail.com> wrote:
On Wed, Jan 24, 2018 at 1:37 AM, Mark Brown <broonie@kernel.org> wrote:
On Tue, Jan 23, 2018 at 07:08:15PM +0200, Andy Shevchenko wrote:
If it's not critical, I would suggest to wait till v4.16-rc1, where I would like to push [1], and switch to DEFINE_SHOW_ATTRIBUTE() macro.
Too late, I already applied this - a further conversion for the new macro would be good. I can send another patch after the following patch is merged: https://patchwork.kernel.org/patch/10178813/
It's merged. I think whenever Mark switched his repositories for new cycle you may be able to submit a patch. -- With Best Regards, Andy Shevchenko
On Thu, Feb 08, 2018 at 04:25:10PM +0200, Andy Shevchenko wrote:
On Fri, Jan 26, 2018 at 9:16 AM, Donglin Peng <dolinux.peng@gmail.com> wrote:
I can send another patch after the following patch is merged: https://patchwork.kernel.org/patch/10178813/
It's merged. I think whenever Mark switched his repositories for new cycle you may be able to submit a patch.
Send it any time, I'll just not apply it until after -rc1 comes out.
Okay, I will send it later. On Thu, Feb 8, 2018 at 11:42 PM, Mark Brown <broonie@kernel.org> wrote:
On Thu, Feb 08, 2018 at 04:25:10PM +0200, Andy Shevchenko wrote:
On Fri, Jan 26, 2018 at 9:16 AM, Donglin Peng <dolinux.peng@gmail.com> wrote:
I can send another patch after the following patch is merged: https://patchwork.kernel.org/patch/10178813/
It's merged. I think whenever Mark switched his repositories for new cycle you may be able to submit a patch.
Send it any time, I'll just not apply it until after -rc1 comes out.
participants (3)
-
Andy Shevchenko -
Donglin Peng -
Mark Brown