netdev - [PATCH 2/2 net-next] cxgb3/l2t: Use struct

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Date:   Fri, 29 Mar 2019 10:28:41 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Vishal Kulkarni <vishal@...lsio.com>,
        "David S. Miller" <davem@...emloft.net>,
        Neil Horman <nhorman@...driver.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH 2/2 net-next] cxgb3/l2t: Use struct_size() in kvzalloc()

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[];
};

size = sizeof(struct foo) + count * sizeof(struct boo);
instance = kvzalloc(size, GFP_KERNEL);

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

instance = kvzalloc(struct_size(instance, entry, count), GFP_KERNEL);

Notice that, in this case, variable size is not necessary, hence
it is removed.

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 drivers/net/ethernet/chelsio/cxgb3/l2t.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb3/l2t.c b/drivers/net/ethernet/chelsio/cxgb3/l2t.c
index 0e9182d3f02c..b3e4118a15e7 100644
--- a/drivers/net/ethernet/chelsio/cxgb3/l2t.c
+++ b/drivers/net/ethernet/chelsio/cxgb3/l2t.c
@@ -443,9 +443,9 @@ void t3_l2t_update(struct t3cdev *dev, struct neighbour *neigh)
 struct l2t_data *t3_init_l2t(unsigned int l2t_capacity)
 {
 	struct l2t_data *d;
-	int i, size = sizeof(*d) + l2t_capacity * sizeof(struct l2t_entry);
+	int i;
 
-	d = kvzalloc(size, GFP_KERNEL);
+	d = kvzalloc(struct_size(d, l2tab, l2t_capacity), GFP_KERNEL);
 	if (!d)
 		return NULL;
 
-- 
2.21.0