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Message-ID: <47a86753-fd4d-9a7a-c808-5f387c872ab3@linux.ibm.com>
Date: Wed, 8 Jul 2020 11:13:08 +0200
From: Stefan Haberland <sth@...ux.ibm.com>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>,
Jan Hoeppner <hoeppner@...ux.ibm.com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ibm.com>
Cc: linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
"Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: Re: [PATCH][next] s390/dasd: Use struct_size() helper
Am 19.06.20 um 18:56 schrieb Gustavo A. R. Silva:
> 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 <gustavoars@...nel.org>
Thanks for the patch.
Tested and applied.
> ---
> drivers/s390/block/dasd_diag.c | 8 +++-----
> 1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
> index facb588d09e4..7f53ba015300 100644
> --- a/drivers/s390/block/dasd_diag.c
> +++ b/drivers/s390/block/dasd_diag.c
> @@ -506,7 +506,7 @@ 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;
> @@ -534,10 +534,8 @@ 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;
>
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