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block: WARN if bdev inflight counter is negative

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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.

Link: https://lore.kernel.org/linux-raid/[email protected]
Signed-off-by: Yu Kuai <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Reviewed-by: John Garry <[email protected]>
This commit is contained in:
Yu Kuai committed 2025-05-10 16:06:12 +08:00
1 parent 5b8f19aee4
commit f5482ee5ed
1 file changed
+2 -2
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block/genhd.c
+2 -2
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@@ -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;
}