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i40e: Use struct_size() in 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[];
};

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>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Gustavo A. R. Silva 2019-03-29 16:38:49 -07:00 committed by Jeff Kirsher
parent 0a92892c69
commit 825f0a4eb7
1 changed files with 2 additions and 4 deletions
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6
drivers/net/ethernet/intel/i40e/i40e_client.c
View File

@ -578,11 +578,9 @@ static int i40e_client_setup_qvlist(struct i40e_info *ldev,
struct i40e_hw *hw = &pf->hw;
struct i40e_qv_info *qv_info;
u32 v_idx, i, reg_idx, reg;
u32 size;
size = sizeof(struct i40e_qvlist_info) +
(sizeof(struct i40e_qv_info) * (qvlist_info->num_vectors - 1));
ldev->qvlist_info = kzalloc(size, GFP_KERNEL);
ldev->qvlist_info = kzalloc(struct_size(ldev->qvlist_info, qv_info,
qvlist_info->num_vectors - 1), GFP_KERNEL);
if (!ldev->qvlist_info)
return -ENOMEM;
ldev->qvlist_info->num_vectors = qvlist_info->num_vectors;