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authorTejun Heo <tj@kernel.org>2020-03-10 13:07:46 -0400
committerJens Axboe <axboe@kernel.dk>2020-03-10 11:37:00 -0600
commitdcd6589b11d3b1e71f516a87a7b9646ed356b4c0 (patch)
tree91180ac53f515b5e6e293f2828fef6bbb812b1a8
parent14afc59361976c0ba39e3a9589c3eaa43ebc7e1d (diff)
blk-iocost: fix incorrect vtime comparison in iocg_is_idle()
vtimes may wrap and time_before/after64() should be used to determine whether a given vtime is before or after another. iocg_is_idle() was incorrectly using plain "<" comparison do determine whether done_vtime is before vtime. Here, the only thing we're interested in is whether done_vtime matches vtime which indicates that there's nothing in flight. Let's test for inequality instead. Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: 7caa47151ab2 ("blkcg: implement blk-iocost") Cc: stable@vger.kernel.org # v5.4+ Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--block/blk-iocost.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 27ca68621137..9a599cc28c29 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -1318,7 +1318,7 @@ static bool iocg_is_idle(struct ioc_gq *iocg)
return false;
/* is something in flight? */
- if (atomic64_read(&iocg->done_vtime) < atomic64_read(&iocg->vtime))
+ if (atomic64_read(&iocg->done_vtime) != atomic64_read(&iocg->vtime))
return false;
return true;