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-rw-r--r--drivers/s390/block/scm_blk_cluster.c6
1 files 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));
}
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