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authorPranith Kumar <bobby.prani@gmail.com>2014-10-28 15:09:56 -0700
committerMike Snitzer <snitzer@redhat.com>2014-11-10 15:25:29 -0500
commit33423974bfc1c61193df765078f0466fece7021e (patch)
tree7be12b81b13b978cda2f483a875c39a4def34dab /drivers
parent42d6a8ce3c3f70bf77a40ace385f59e1b5b9918f (diff)
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: Pranith Kumar <bobby.prani@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/dm.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 0fee0e54d36f..c5e14eee8c76 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -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;

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