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btrfs: Document locking requirement via lockdep_assert_held 

Remove stale comment since there is no longer an eb->eb_lock and
document the locking expectation with a lockdep_assert_held statement.
No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2018-06-27 16:38:23 +03:00 committed by David Sterba
parent 55ac01396a
commit 07e21c4dad
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/extent_io.c
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@ -5066,9 +5066,10 @@ static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head)
__free_extent_buffer(eb);
}
/* Expects to have eb->eb_lock already held */
static int release_extent_buffer(struct extent_buffer *eb)
{
lockdep_assert_held(&eb->refs_lock);
WARN_ON(atomic_read(&eb->refs) == 0);
if (atomic_dec_and_test(&eb->refs)) {
if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) {