AuxXxilium/linux_dsm_epyc7002
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dm: Use rcu_dereference() for accessing rcu pointer

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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:
Pranith Kumar 2014-10-28 15:09:56 -07:00 committed by Mike Snitzer
parent 42d6a8ce3c
commit 33423974bf
1 changed files with 4 additions and 4 deletions
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8
drivers/md/dm.c
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@ -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); 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); rcu_assign_pointer(md->map, t);
md->immutable_target_type = dm_table_get_immutable_target_type(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) 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) if (!map)
return NULL; return NULL;
@ -2745,7 +2745,7 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
goto out_unlock; goto out_unlock;
} }
map = md->map; map = rcu_dereference(md->map);
/* /*
* DMF_NOFLUSH_SUSPENDING must be set before presuspend. * DMF_NOFLUSH_SUSPENDING must be set before presuspend.
@ -2839,7 +2839,7 @@ int dm_resume(struct mapped_device *md)
if (!dm_suspended_md(md)) if (!dm_suspended_md(md))
goto out; goto out;
map = md->map; map = rcu_dereference(md->map);
if (!map || !dm_table_get_size(map)) if (!map || !dm_table_get_size(map))
goto out; goto out;