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ixgbe: Use struct_size() helper 

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 = kzalloc(size, GFP_KERNEL);

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

instance = kzalloc(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@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gustavo A. R. Silva 2019-02-07 22:22:58 -06:00 committed by David S. Miller
parent 196d7311fa
commit 439bb9edd4
1 changed files with 5 additions and 5 deletions
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10
drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
View File

@ -836,12 +836,10 @@ static int ixgbe_alloc_q_vector(struct ixgbe_adapter *adapter,
struct ixgbe_ring *ring;
int node = NUMA_NO_NODE;
int cpu = -1;
int ring_count, size;
int ring_count;
u8 tcs = adapter->hw_tcs;
ring_count = txr_count + rxr_count + xdp_count;
size = sizeof(struct ixgbe_q_vector) +
(sizeof(struct ixgbe_ring) * ring_count);
/* customize cpu for Flow Director mapping */
if ((tcs <= 1) && !(adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)) {
@ -855,9 +853,11 @@ static int ixgbe_alloc_q_vector(struct ixgbe_adapter *adapter,
}
/* allocate q_vector and rings */
q_vector = kzalloc_node(size, GFP_KERNEL, node);
q_vector = kzalloc_node(struct_size(q_vector, ring, ring_count),
GFP_KERNEL, node);
if (!q_vector)
q_vector = kzalloc(size, GFP_KERNEL);
q_vector = kzalloc(struct_size(q_vector, ring, ring_count),
GFP_KERNEL);
if (!q_vector)
return -ENOMEM;