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mtd: create per-device and module-scope debugfs entries

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Several MTD devices are using debugfs entries created in the root.
This commit provides the means for a standardized subtree, creating
one "mtd" entry at root, and one entry per device inside it, named
after the device.
The tree is registered in add_mtd_device, and released in
del_mtd_device.
Devices docg3, mtdswap and nandsim were updated to use this subtree
instead of custom ones, and their entries were prefixed with the
drivers' names.

Signed-off-by: Mario J. Rugiero <mrugiero@gmail.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Mario Rugiero
2017-05-29 08:38:41 -03:00
committed by Brian Norris
parent 5771a8c088
commit e8e3edb95c
6 changed files with 57 additions and 82 deletions
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18
drivers/mtd/mtdswap.c
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@@ -138,8 +138,6 @@ struct mtdswap_dev {
char *page_buf;
char *oob_buf;
struct dentry *debugfs_root;
};
struct mtdswap_oobdata {
@@ -1318,26 +1316,19 @@ static int mtdswap_add_debugfs(struct mtdswap_dev *d)
struct gendisk *gd = d->mbd_dev->disk;
struct device *dev = disk_to_dev(gd);
struct dentry *root;
struct dentry *root = d->mtd->dbg.dfs_dir;
struct dentry *dent;
root = debugfs_create_dir(gd->disk_name, NULL);
if (IS_ERR(root))
if (!IS_ENABLED(CONFIG_DEBUG_FS))
return 0;
if (!root) {
dev_err(dev, "failed to initialize debugfs\n");
if (IS_ERR_OR_NULL(root))
return -1;
}
d->debugfs_root = root;
dent = debugfs_create_file("stats", S_IRUSR, root, d,
dent = debugfs_create_file("mtdswap_stats", S_IRUSR, root, d,
&mtdswap_fops);
if (!dent) {
dev_err(d->dev, "debugfs_create_file failed\n");
debugfs_remove_recursive(root);
d->debugfs_root = NULL;
return -1;
}
@@ -1540,7 +1531,6 @@ static void mtdswap_remove_dev(struct mtd_blktrans_dev *dev)
{
struct mtdswap_dev *d = MTDSWAP_MBD_TO_MTDSWAP(dev);
debugfs_remove_recursive(d->debugfs_root);
del_mtd_blktrans_dev(dev);
mtdswap_cleanup(d);
kfree(d);