dm log: use standard kernel module refcount
Avoid private module usage accounting by removing 'use' from
dm_dirty_log_internal. The standard module reference counting is
sufficient.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 737961f..094c8f0 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -20,7 +20,6 @@
struct dm_dirty_log_type *type;
struct list_head list;
- long use;
};
static LIST_HEAD(_log_types);
@@ -44,12 +43,8 @@
spin_lock(&_lock);
log_type = __find_dirty_log_type(name);
- if (log_type) {
- if (!log_type->use && !try_module_get(log_type->type->module))
- log_type = NULL;
- else
- log_type->use++;
- }
+ if (log_type && !try_module_get(log_type->type->module))
+ log_type = NULL;
spin_unlock(&_lock);
@@ -120,10 +115,7 @@
if (!log_type)
goto out;
- if (!--log_type->use)
- module_put(type->module);
-
- BUG_ON(log_type->use < 0);
+ module_put(type->module);
out:
spin_unlock(&_lock);
@@ -173,11 +165,6 @@
return -EINVAL;
}
- if (log_type->use) {
- spin_unlock(&_lock);
- return -ETXTBSY;
- }
-
list_del(&log_type->list);
spin_unlock(&_lock);