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staging: mt7621-dma: 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;
    void *entry[];
};

instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * 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 <gustavo@embeddedor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gustavo A. R. Silva 2019-01-04 15:30:47 -06:00 committed by Greg Kroah-Hartman
parent 037e9edf9d
commit 045ee2d0d0
1 changed files with 3 additions and 3 deletions
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4
drivers/staging/mt7621-dma/ralink-gdma.c
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@ -821,8 +821,8 @@ static int gdma_dma_probe(struct platform_device *pdev)
return -EINVAL;
data = (struct gdma_data *) match->data;
dma_dev = devm_kzalloc(&pdev->dev, sizeof(*dma_dev) +
(sizeof(struct gdma_dmaengine_chan) * data->chancnt),
dma_dev = devm_kzalloc(&pdev->dev,
struct_size(dma_dev, chan, data->chancnt),
GFP_KERNEL);
if (!dma_dev) {
dev_err(&pdev->dev, "alloc dma device failed\n");