i3c: master: 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, 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>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 1318adfe0216..d6f8b038a896 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -950,9 +950,8 @@ 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;