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net: hns: Use struct_size() in devm_kzalloc()

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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) + count * sizeof(struct boo), 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 <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gustavo A. R. Silva
2019-01-15 19:04:56 -06:00
committed by David S. Miller
parent 5db5ea995f
commit 4559dd2482
1 changed files with 3 additions and 2 deletions
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5
drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c
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@@ -788,8 +788,9 @@ int hns_rcb_common_get_cfg(struct dsaf_device *dsaf_dev,
int ring_num = hns_rcb_get_ring_num(dsaf_dev);
rcb_common =
devm_kzalloc(dsaf_dev->dev, sizeof(*rcb_common) +
ring_num * sizeof(struct ring_pair_cb), GFP_KERNEL);
devm_kzalloc(dsaf_dev->dev,
struct_size(rcb_common, ring_pair_cb, ring_num),
GFP_KERNEL);
if (!rcb_common) {
dev_err(dsaf_dev->dev, "rcb common devm_kzalloc fail!\n");
return -ENOMEM;