[PATCH v3 6/8] dm: add add_disk() error handling

Luis Chamberlain
2021-08-30T21:26:15Z

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.

There are two calls to dm_setup_md_queue() which can fail then,
one on dm_early_create() and we can easily see that the error path
there calls dm_destroy in the error path. The other use case is on
the ioctl table_load case. If that fails userspace needs to call
the DM_DEV_REMOVE_CMD to cleanup the state - similar to any other
failure.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
drivers/md/dm.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 7981b7287628..4e6b9d6ac508 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2077,7 +2077,9 @@ int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
if (r)
return r;

- add_disk(md->disk);
+ r = add_disk(md->disk);
+ if (r)
+ return r;

r = dm_sysfs_init(md);
if (r) {
--
2.30.2