[PATCH 11/15] zram: Pass attribute group to device_add_disk

Fam Zheng
2016-08-17T07:15:11Z

Previously after device_add_disk returns, the KOBJ_ADD uevent is already
emitted. Adding attributes after that is a poor usage of kobject, and
in practice may result in race conditions with userspace, for
example udev checks availability of certain attributes and initializes
/dev entries conditionally.

device_add_disk can handle adding attribute group better, so use it.
Meanwhile, update the error check code and message.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
drivers/block/zram/zram_drv.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 20920a2..2331788 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1298,13 +1298,10 @@ static int zram_add(void)
zram->disk->queue->limits.discard_zeroes_data = 0;
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, zram->disk->queue);

- device_add_disk(NULL, zram->disk, NULL);
+ ret = device_add_disk(NULL, zram->disk, &zram_disk_attr_group);

- ret = sysfs_create_group(&disk_to_dev(zram->disk)->kobj,
- &zram_disk_attr_group);
if (ret < 0) {
- pr_err("Error creating sysfs group for device %d\n",
- device_id);
+ pr_err("Error creating disk %d\n", device_id);
goto out_free_disk;
}
strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor));
--
2.7.4