diff options
| author | Pranith Kumar <bobby.prani@gmail.com> | 2014-10-28 23:09:56 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2014-11-10 21:25:29 +0100 |
| commit | 33423974bfc1c61193df765078f0466fece7021e (patch) | |
| tree | 7be12b81b13b978cda2f483a875c39a4def34dab /drivers/md | |
| parent | dm thin: refactor requeue_io to eliminate spinlock bouncing (diff) | |
| download | linux-33423974bfc1c61193df765078f0466fece7021e.tar.xz linux-33423974bfc1c61193df765078f0466fece7021e.zip | |
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/md')
| -rw-r--r-- | drivers/md/dm.c | 8 |
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; |