mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-11 21:14:07 +08:00
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>
This commit is contained in:
parent
42d6a8ce3c
commit
33423974bf
@ -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;
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user