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authorSebastian Ott <sebott@linux.vnet.ibm.com>2015-02-23 19:50:47 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2015-02-26 09:24:47 +0100
commita13ccb04af4aa6632c11d59ddf6555aa80ffb139 (patch)
tree826e0c56038f7f785bd7f976dfd1a6acb5905e25 /drivers/s390
parent72dace969da8bf953915fd1776d6c15e7a41a675 (diff)
downloadlinux-next-a13ccb04af4aa6632c11d59ddf6555aa80ffb139.tar.gz
s390/scm_block: fix off by one during cluster reservation
We increase the msb_count after we're finished building the request. That way we can always access the current request via scmrq->request[msb_count] . But once the request is started we need to make sure that the array index stays below msb_count. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/block/scm_blk_cluster.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/block/scm_blk_cluster.c b/drivers/s390/block/scm_blk_cluster.c
index 09db45296eed..7497ddde2dd6 100644
--- a/drivers/s390/block/scm_blk_cluster.c
+++ b/drivers/s390/block/scm_blk_cluster.c
@@ -92,7 +92,7 @@ bool scm_reserve_cluster(struct scm_request *scmrq)
add = 0;
continue;
}
- for (pos = 0; pos <= iter->aob->request.msb_count; pos++) {
+ for (pos = 0; pos < iter->aob->request.msb_count; pos++) {
if (clusters_intersect(req, iter->request[pos]) &&
(rq_data_dir(req) == WRITE ||
rq_data_dir(iter->request[pos]) == WRITE)) {