linux-kernel - Re: [PATCH 2/2] mtd: core: Remove partid and partname debugfs files

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Date:   Mon, 20 Dec 2021 13:23:00 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <p.yadav@...com>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <zhuohao@...omium.org>, <michael@...le.cc>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mtd: core: Remove partid and partname debugfs files

On 12/20/21 3:07 PM, Pratyush Yadav wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On 17/12/21 02:26PM, Tudor Ambarus wrote:
>> partid and partname debugfs file are no longer used in mtd, remove

s/file/files

>> dead code.
> 
> Hmm, spi-nor was the only user? Quick grepping does confirm that.

Yes.

> 
>>
>> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
>> ---
>>  drivers/mtd/mtdcore.c   | 35 +----------------------------------
>>  include/linux/mtd/mtd.h |  3 ---
>>  2 files changed, 1 insertion(+), 37 deletions(-)
>>
>> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
>> index 9186268d361b..1977755fc955 100644
>> --- a/drivers/mtd/mtdcore.c
>> +++ b/drivers/mtd/mtdcore.c
>> @@ -336,49 +336,16 @@ static const struct device_type mtd_devtype = {
>>       .release        = mtd_release,
>>  };
>>
>> -static int mtd_partid_debug_show(struct seq_file *s, void *p)
>> -{
>> -     struct mtd_info *mtd = s->private;
>> -
>> -     seq_printf(s, "%s\n", mtd->dbg.partid);
>> -
>> -     return 0;
>> -}
>> -
>> -DEFINE_SHOW_ATTRIBUTE(mtd_partid_debug);
>> -
>> -static int mtd_partname_debug_show(struct seq_file *s, void *p)
>> -{
>> -     struct mtd_info *mtd = s->private;
>> -
>> -     seq_printf(s, "%s\n", mtd->dbg.partname);
>> -
>> -     return 0;
>> -}
>> -
>> -DEFINE_SHOW_ATTRIBUTE(mtd_partname_debug);
>> -
>>  static struct dentry *dfs_dir_mtd;
>>
>>  static void mtd_debugfs_populate(struct mtd_info *mtd)
>>  {
>> -     struct mtd_info *master = mtd_get_master(mtd);
>>       struct device *dev = &mtd->dev;
>> -     struct dentry *root;
>>
>>       if (IS_ERR_OR_NULL(dfs_dir_mtd))
>>               return;
>>
>> -     root = debugfs_create_dir(dev_name(dev), dfs_dir_mtd);
>> -     mtd->dbg.dfs_dir = root;
>> -
>> -     if (master->dbg.partid)
>> -             debugfs_create_file("partid", 0400, root, master,
>> -                                 &mtd_partid_debug_fops);
>> -
>> -     if (master->dbg.partname)
>> -             debugfs_create_file("partname", 0400, root, master,
>> -                                 &mtd_partname_debug_fops);
>> +     mtd->dbg.dfs_dir = debugfs_create_dir(dev_name(dev), dfs_dir_mtd);
> 
> What is the point of having creating the directory if there is not going
> to be anything in it at all? I think we should drop the entire thing if
There will be files in it: mtdswap_stats, nandsim_wear_report, docg3 files.

$ git grep dbg.dfs_dir drivers/mtd/
drivers/mtd/devices/docg3.c:    struct dentry *root = floor->dbg.dfs_dir;
drivers/mtd/mtdcore.c:  mtd->dbg.dfs_dir = root;
drivers/mtd/mtdcore.c:          debugfs_remove_recursive(mtd->dbg.dfs_dir);
drivers/mtd/mtdswap.c:  struct dentry *root = d->mtd->dbg.dfs_dir;
drivers/mtd/nand/raw/nandsim.c: struct dentry *root = nsmtd->dbg.dfs_dir;
drivers/mtd/ubi/debug.c:                debugfs_remove_recursive(ubi->dbg.dfs_dir);