linux-kernel - [PATCH 5/5] IB/hfi1: Improve another size determination in hfi1_user_sdma_process

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Date:   Fri, 10 Feb 2017 22:05:40 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-rdma@...r.kernel.org,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Sean Hefty <sean.hefty@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 5/5] IB/hfi1: Improve another size determination in
 hfi1_user_sdma_process_request()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Fri, 10 Feb 2017 21:45:38 +0100

Replace the specification of a data structure by a reference to
the desired member as the parameter for the operator "sizeof" to make
the corresponding size determination a bit safer according to
the Linux coding style convention.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/infiniband/hw/hfi1/user_sdma.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/hfi1/user_sdma.c b/drivers/infiniband/hw/hfi1/user_sdma.c
index 5a73d738f2ba..da131a530b88 100644
--- a/drivers/infiniband/hw/hfi1/user_sdma.c
+++ b/drivers/infiniband/hw/hfi1/user_sdma.c
@@ -704,7 +704,9 @@ int hfi1_user_sdma_process_request(struct file *fp, struct iovec *iovec,
 	/* Save all the IO vector structures */
 	for (i = 0; i < req->data_iovs; i++) {
 		INIT_LIST_HEAD(&req->iovs[i].list);
-		memcpy(&req->iovs[i].iov, iovec + idx++, sizeof(struct iovec));
+		memcpy(&req->iovs[i].iov,
+		       iovec + idx++,
+		       sizeof(req->iovs[i].iov));
 		ret = pin_vector_pages(req, &req->iovs[i]);
 		if (ret) {
 			req->status = ret;
-- 
2.11.1