[PATCH v2 05/15] um/drivers/ubd_kern: add error handling support for add_disk()

Luis Chamberlain
2021-09-27T22:02:22Z

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

ubd_disk_register() never returned an error, so just fix
that now and let the caller handle the error condition.

Reviewed-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
arch/um/drivers/ubd_kern.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index cd9dc0556e91..81045c199c30 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -854,8 +854,8 @@ static const struct attribute_group *ubd_attr_groups[] = {
NULL,
};

-static void ubd_disk_register(int major, u64 size, int unit,
- struct gendisk *disk)
+static int ubd_disk_register(int major, u64 size, int unit,
+ struct gendisk *disk)
{
disk->major = major;
disk->first_minor = unit << UBD_SHIFT;
@@ -872,7 +872,7 @@ static void ubd_disk_register(int major, u64 size, int unit,

disk->private_data = &ubd_devs[unit];
disk->queue = ubd_devs[unit].queue;
- device_add_disk(&ubd_devs[unit].pdev.dev, disk, ubd_attr_groups);
+ return device_add_disk(&ubd_devs[unit].pdev.dev, disk, ubd_attr_groups);
}

#define ROUND_BLOCK(n) ((n + (SECTOR_SIZE - 1)) & (-SECTOR_SIZE))
@@ -919,10 +919,15 @@ static int ubd_add(int n, char **error_out)
blk_queue_write_cache(ubd_dev->queue, true, false);
blk_queue_max_segments(ubd_dev->queue, MAX_SG);
blk_queue_segment_boundary(ubd_dev->queue, PAGE_SIZE - 1);
- ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, disk);
+ err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, disk);
+ if (err)
+ goto out_cleanup_disk;
+
ubd_gendisk[n] = disk;
return 0;

+out_cleanup_disk:
+ blk_cleanup_disk(disk);
out_cleanup_tags:
blk_mq_free_tag_set(&ubd_dev->tag_set);
out:
--
2.30.2