LU-14713 llite: mend the trunc_sem_up_write()

[fs/lustre-release.git] / lustre / llite / llite_internal.h

diff --git a/lustre/llite/llite_internal.h b/lustre/llite/llite_internal.h
index 0d914b4..7d27214 100644 (file)
--- a/lustre/llite/llite_internal.h
+++ b/lustre/llite/llite_internal.h
@@ -351,6 +351,8 @@ static inline void trunc_sem_down_write(struct ll_trunc_sem *sem)
 static inline void trunc_sem_up_write(struct ll_trunc_sem *sem)
 {
        atomic_set(&sem->ll_trunc_readers, 0);
+       /* match the smp_mb() in wait_var_event()->prepare_to_wait() */
+       smp_mb();
        wake_up_var(&sem->ll_trunc_readers);
 }