[PATCH] i3c: master: Use struct_size() helper

From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Boris Brezillon <bbrezillon@kernel.org>
Cc: linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH] i3c: master: Use struct_size() helper
Date: Fri, 31 May 2019 12:35:32 -0500	[thread overview]
Message-ID: <20190531173532.GA7141@embeddedor> (raw)

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes, in particular in the
context in which this code is being used.

So, replace the following form:

sizeof(*defslvs) + ((ndevs - 1) * sizeof(struct i3c_ccc_dev_desc))

with:

struct_size(defslvs, slaves, ndevs - 1)

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
 drivers/i3c/master.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index b9d2b88928e1..923b04052038 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -924,9 +924,8 @@ int i3c_master_defslvs_locked(struct i3c_master_controller *master)
 		ndevs++;
 
 	defslvs = i3c_ccc_cmd_dest_init(&dest, I3C_BROADCAST_ADDR,
-					sizeof(*defslvs) +
-					((ndevs - 1) *
-					 sizeof(struct i3c_ccc_dev_desc)));
+					struct_size(defslvs, slaves,
+					ndevs - 1));
 	if (!defslvs)
 		return -ENOMEM;
 
-- 
2.21.0

