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Commit 33423974 authored by Pranith Kumar's avatar Pranith Kumar Committed by Mike Snitzer
Browse files

dm: Use rcu_dereference() for accessing rcu pointer 



The map field in 'struct mapped_device' is an rcu pointer. Use rcu_dereference()
while accessing it.

Signed-off-by: default avatarPranith Kumar <bobby.prani@gmail.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 42d6a8ce

drivers/md/dm.c

+4 −4
Original line number Diff line number Diff line
@@ -2332,7 +2332,7 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, 


	merge_is_optional = dm_table_merge_is_optional(t);



	old_map = md->map;

	old_map = rcu_dereference(md->map);

	rcu_assign_pointer(md->map, t);

	md->immutable_target_type = dm_table_get_immutable_target_type(t);
@@ -2351,7 +2351,7 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, 
 */

static struct dm_table *__unbind(struct mapped_device *md)

{

	struct dm_table *map = md->map;

	struct dm_table *map = rcu_dereference(md->map);



	if (!map)

		return NULL;
@@ -2745,7 +2745,7 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags) 
		goto out_unlock;

	}



	map = md->map;

	map = rcu_dereference(md->map);



	/*

	 * DMF_NOFLUSH_SUSPENDING must be set before presuspend.
@@ -2839,7 +2839,7 @@ int dm_resume(struct mapped_device *md) 
	if (!dm_suspended_md(md))

		goto out;



	map = md->map;

	map = rcu_dereference(md->map);

	if (!map || !dm_table_get_size(map))

		goto out;