From bd86055fc938493259a15dc00ee77435b4d2e83f Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Thu, 25 Apr 2013 13:02:39 +0200 Subject: [PATCH] s390/scm_blk: allow more cluster size values Allow 0 and powers of 2 between 2 and 128 for write_cluster_size. Reviewed-by: Peter Oberparleiter Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky --- drivers/s390/block/scm_blk_cluster.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/s390/block/scm_blk_cluster.c b/drivers/s390/block/scm_blk_cluster.c index f4bb61b..c0d102e 100644 --- a/drivers/s390/block/scm_blk_cluster.c +++ b/drivers/s390/block/scm_blk_cluster.c @@ -223,6 +223,8 @@ void scm_cluster_request_irq(struct scm_request *scmrq) bool scm_cluster_size_valid(void) { - return write_cluster_size == 0 || write_cluster_size == 32 || - write_cluster_size == 64 || write_cluster_size == 128; + if (write_cluster_size == 1 || write_cluster_size > 128) + return false; + + return !(write_cluster_size & (write_cluster_size - 1)); } -- 2.7.4