[PATCH v2 3/9] block: WARN if bdev inflight counter is negative

[Yu Kuai]

From: Yu Kuai <yuku...@huawei.com>

Which means there is a BUG for related bio-based disk driver, or blk-mq
for rq-based disk, it's better not to hide the BUG.

Signed-off-by: Yu Kuai <yuku...@huawei.com>
---
 block/genhd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index f671d9ee00c4..d158c25237b6 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -136,9 +136,9 @@ static void part_in_flight_rw(struct block_device *part,
                inflight[0] += part_stat_local_read_cpu(part, in_flight[0], 
cpu);
                inflight[1] += part_stat_local_read_cpu(part, in_flight[1], 
cpu);
        }
-       if ((int)inflight[0] < 0)
+       if (WARN_ON_ONCE((int)inflight[0] < 0))
                inflight[0] = 0;
-       if ((int)inflight[1] < 0)
+       if (WARN_ON_ONCE((int)inflight[1] < 0))
                inflight[1] = 0;
 }
 
-- 
2.39.2