From: Zev Weiss zev@bewilderbeest.net
[ Upstream commit c13de2386c78e890d4ae6f01a85eefd0b293fb08 ]
Previously, if del_mtd_device() failed with -EBUSY due to a non-zero usecount, a subsequent call to attempt the deletion again would try to remove a debugfs directory that had already been removed and panic. With this change the second call can instead proceed safely.
Fixes: e8e3edb95ce6 ("mtd: create per-device and module-scope debugfs entries") Signed-off-by: Zev Weiss zev@bewilderbeest.net Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Link: https://lore.kernel.org/linux-mtd/20211014203953.5424-1-zev@bewilderbeest.ne... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mtd/mtdcore.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 32a76b8feaa5d..ac5d3b6db9b84 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -727,8 +727,6 @@ int del_mtd_device(struct mtd_info *mtd)
mutex_lock(&mtd_table_mutex);
- debugfs_remove_recursive(mtd->dbg.dfs_dir); - if (idr_find(&mtd_idr, mtd->index) != mtd) { ret = -ENODEV; goto out_error; @@ -744,6 +742,8 @@ int del_mtd_device(struct mtd_info *mtd) mtd->index, mtd->name, mtd->usecount); ret = -EBUSY; } else { + debugfs_remove_recursive(mtd->dbg.dfs_dir); + /* Try to remove the NVMEM provider */ if (mtd->nvmem) nvmem_unregister(mtd->nvmem);