From 33423974bfc1c61193df765078f0466fece7021e Mon Sep 17 00:00:00 2001 From: Pranith Kumar Date: Tue, 28 Oct 2014 15:09:56 -0700 Subject: [PATCH] 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 Signed-off-by: Paul E. McKenney Signed-off-by: Mike Snitzer --- drivers/md/dm.c | 8 ++++---- 1 file 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; -- 2.20.1