dm: sysfs add empty release function to avoid debug warning

This patch just removes an unnecessary warning:
 kobject: 'dm': does not have a release() function,
 it is broken and must be fixed.

The kobject is embedded in mapped device struct, so
code does not need to release memory explicitly here.

Cc: stable@kernel.org
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-sysfs.c b/drivers/md/dm-sysfs.c
index 4b045903a4e21e6ce6e0c06593c7ed7e867a13b1..b000de38c99aabc36828a65ca2b00a8e15e8b25a 100644 (file)
--- a/drivers/md/dm-sysfs.c
+++ b/drivers/md/dm-sysfs.c
@@ -79,6 +79,13 @@ static struct sysfs_ops dm_sysfs_ops = {
        .show   = dm_attr_show,
 };
 
+/*
+ * The sysfs structure is embedded in md struct, nothing to do here
+ */
+static void dm_sysfs_release(struct kobject *kobj)
+{
+}
+
 /*
  * dm kobject is embedded in mapped_device structure
  * no need to define release function here
@@ -86,6 +93,7 @@ static struct sysfs_ops dm_sysfs_ops = {
 static struct kobj_type dm_ktype = {
        .sysfs_ops      = &dm_sysfs_ops,
        .default_attrs  = dm_attrs,
+       .release        = dm_sysfs_release
 };
 
 /*