When bio_end_io_acct ends, the count of in-progress I/Os may reach zero and the device may be suspended. There is a possibility that the suspend races with dm_stats_account_io. We need to call dm_stats_account_io before bio_end_io_acct.
Signed-off-by: Mikulas Patocka <[email protected]> Cc: [email protected] --- drivers/md/dm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6/drivers/md/dm.c =================================================================== --- linux-2.6.orig/drivers/md/dm.c 2022-02-18 17:03:51.000000000 +0100 +++ linux-2.6/drivers/md/dm.c 2022-02-18 17:04:34.000000000 +0100 @@ -501,13 +501,13 @@ static void end_io_acct(struct mapped_de { unsigned long duration = jiffies - start_time; - bio_end_io_acct(bio, start_time); - if (unlikely(dm_stats_used(&md->stats))) dm_stats_account_io(&md->stats, bio_data_dir(bio), bio->bi_iter.bi_sector, bio_sectors(bio), true, duration, stats_aux); + bio_end_io_acct(bio, start_time); + /* nudge anyone waiting on suspend queue */ if (unlikely(wq_has_sleeper(&md->wait))) wake_up(&md->wait); -- dm-devel mailing list [email protected] https://listman.redhat.com/mailman/listinfo/dm-devel
