[PATCH] staging/lustre: use rcu_dereference to access rcu protected current->real_parent field

[Evgeny Budilovsky]

Signed-off-by: Evgeny Budilovsky <budevg at gmail.com>
---
 drivers/staging/lustre/lustre/llite/lproc_llite.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/lustre/lustre/llite/lproc_llite.c b/drivers/staging/lustre/lustre/llite/lproc_llite.c
index 77f68b5..7e61468 100644
--- a/drivers/staging/lustre/lustre/llite/lproc_llite.c
+++ b/drivers/staging/lustre/lustre/llite/lproc_llite.c
@@ -910,7 +910,8 @@ void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, int count)
 		 sbi->ll_stats_track_id == current->pid)
 		lprocfs_counter_add(sbi->ll_stats, op, count);
 	else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
-		 sbi->ll_stats_track_id == current->real_parent->pid)
+		 sbi->ll_stats_track_id ==
+			rcu_dereference(current->real_parent)->pid)
 		lprocfs_counter_add(sbi->ll_stats, op, count);
 	else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
 		 sbi->ll_stats_track_id ==
-- 
1.8.1.2