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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 <oberpar@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2013-04-25 13:02:39 +02:00 committed by Martin Schwidefsky
parent 3ad19b8fb0
commit bd86055fc9
1 changed files with 4 additions and 2 deletions
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6
drivers/s390/block/scm_blk_cluster.c
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@ -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));
}