[PATCH net-next] net: hns: use struct_size() in devm_kzalloc()

[Gustavo A. R. Silva]

One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct foo {
    int stuff;
    struct boo entry[];
};

instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(struct boo) * count, 
GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:

instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gust...@embeddedor.com>
---
 drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c 
b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c
index 0942e4916d9d..3d07c8a7639d 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c
@@ -83,8 +83,9 @@ static int hns_ppe_common_get_cfg(struct dsaf_device 
*dsaf_dev, int comm_index)
        else
                ppe_num = HNS_PPE_DEBUG_NW_ENGINE_NUM;
 
-       ppe_common = devm_kzalloc(dsaf_dev->dev, sizeof(*ppe_common) +
-               ppe_num * sizeof(struct hns_ppe_cb), GFP_KERNEL);
+       ppe_common = devm_kzalloc(dsaf_dev->dev,
+                                 struct_size(ppe_common, ppe_cb, ppe_num),
+                                 GFP_KERNEL);
        if (!ppe_common)
                return -ENOMEM;
 
-- 
2.20.1