From 10321aa17ae9ad9b1335d61aeabb6f63d38cc28e Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Tue, 14 Jul 2020 22:03:27 +0200 Subject: s390/dasd: Use struct_size() helper Make use of the struct_size() helper instead of an open-coded version in order to avoid any potential type mistakes. Also, remove unnecessary variable _datasize_. This code was detected with the help of Coccinelle and, audited and fixed manually. Signed-off-by: Gustavo A. R. Silva Signed-off-by: Stefan Haberland Signed-off-by: Jens Axboe --- drivers/s390/block/dasd_diag.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) (limited to 'drivers') diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c index 069d6b39cacf..1b9e1442e6a5 100644 --- a/drivers/s390/block/dasd_diag.c +++ b/drivers/s390/block/dasd_diag.c @@ -515,7 +515,7 @@ static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev, struct req_iterator iter; struct bio_vec bv; char *dst; - unsigned int count, datasize; + unsigned int count; sector_t recid, first_rec, last_rec; unsigned int blksize, off; unsigned char rw_cmd; @@ -543,10 +543,8 @@ static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev, if (count != last_rec - first_rec + 1) return ERR_PTR(-EINVAL); /* Build the request */ - datasize = sizeof(struct dasd_diag_req) + - count*sizeof(struct dasd_diag_bio); - cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev, - blk_mq_rq_to_pdu(req)); + cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, struct_size(dreq, bio, count), + memdev, blk_mq_rq_to_pdu(req)); if (IS_ERR(cqr)) return cqr; -- cgit v1.2.3