cfq: explicitly use 64bit divide operation for 64bit arguments

'samples' is 64bit operant, but do_div() second parameter is 32.
do_div silently truncates high 32 bits and calculated result
is invalid.

In case if low 32bit of 'samples' are zeros then do_div() produces
kernel crash.

Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 1 insertions, 1 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index f0468e252ee4..51e06ea06a2e 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1803,7 +1803,7 @@ static u64 cfqg_prfill_avg_queue_size(struct seq_file *sf,
 
         if (samples) {
                 v = blkg_stat_read(&cfqg->stats.avg_queue_size_sum);
-                do_div(v, samples);
+                v = div64_u64(v, samples);
         }
         __blkg_prfill_u64(sf, pd, v);
         return 0;