zram: clear disk io accounting when reset zram device

Clear zram disk io accounting when resetting the zram device.  Otherwise
the residual io accounting stat will affect the diskstat in the next
zram active cycle.

Signed-off-by: Weijie Yang <weijie.yang@samsung.com>
Acked-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 8dcbced0eafd..6e134f4759c0 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -805,7 +805,9 @@ static void zram_reset_device(struct zram *zram)
         memset(&zram->stats, 0, sizeof(zram->stats));
         zram->disksize = 0;
         zram->max_comp_streams = 1;
+
         set_capacity(zram->disk, 0);
+        part_stat_set_all(&zram->disk->part0, 0);
 
         up_write(&zram->init_lock);
         /* I/O operation under all of CPU are done so let's free */