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authorMario Rugiero <mrugiero@gmail.com>2017-05-29 08:38:41 -0300
committerBrian Norris <computersforpeace@gmail.com>2017-07-21 13:25:29 -0700
commite8e3edb95ce6a146bc774b6cfad3553f4383edc8 (patch)
tree53cc03ba5c33a3feb27ea46cfc61cc979dfe9651 /drivers/mtd/mtdswap.c
parent5771a8c08880cdca3bfb4a3fc6d309d6bba20877 (diff)
downloadlinux-e8e3edb95ce6a146bc774b6cfad3553f4383edc8.tar.gz
mtd: create per-device and module-scope debugfs entries
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>
Diffstat (limited to 'drivers/mtd/mtdswap.c')
-rw-r--r--drivers/mtd/mtdswap.c18
1 files changed, 4 insertions, 14 deletions
diff --git a/drivers/mtd/mtdswap.c b/drivers/mtd/mtdswap.c
index f12879a3d4ff..6b17932fe557 100644
--- a/drivers/mtd/mtdswap.c
+++ b/drivers/mtd/mtdswap.c
@@ -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);