From a13ccb04af4aa6632c11d59ddf6555aa80ffb139 Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Mon, 23 Feb 2015 19:50:47 +0100 Subject: [PATCH] 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 Signed-off-by: Martin Schwidefsky --- drivers/s390/block/scm_blk_cluster.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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)) { -- 2.20.1