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btrfs: add missing RCU unlock in error path in try_release_subpage_extent_buffer()

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Call rcu_read_lock() before exiting the loop in
try_release_subpage_extent_buffer() because there is a rcu_read_unlock()
call past the loop.

This has been detected by the Clang thread-safety analyzer.

Fixes: ad580dfa38 ("btrfs: fix subpage deadlock in try_release_subpage_extent_buffer()")
CC: stable@vger.kernel.org # 6.18+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Bart Van Assche 2026-02-25 11:59:58 -08:00 committed by David Sterba
parent 5131fa077f
commit b2840e3312
1 changed files with 1 additions and 0 deletions
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1
fs/btrfs/extent_io.c
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@ -4494,6 +4494,7 @@ static int try_release_subpage_extent_buffer(struct folio *folio)
*/
if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) {
spin_unlock(&eb->refs_lock);
rcu_read_lock();
break;
}