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>

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 8dcbced0eafd5f8dc0a53dc8d8e9d4b37bad9bab..6e134f4759c0c9e98b93f221e7687004d4418342 100644 (file)
--- 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 */