1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 73d7860b72e2..b32ff446c3fb 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -643,7 +643,7 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
         if (blk_pc_request(rq)) {
                 what |= BLK_TC_ACT(BLK_TC_PC);
                 __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors,
-                                sizeof(rq->cmd), rq->cmd);
+                                rq->cmd_len, rq->cmd);
         } else  {
                 what |= BLK_TC_ACT(BLK_TC_FS);
                 __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,