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dmaengine: tegra210-adma: 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: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2019-01-07 11:06:31 -06:00 committed by Vinod Koul
parent d3d70373f6
commit 863326a6ee
1 changed files with 3 additions and 2 deletions
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5
drivers/dma/tegra210-adma.c
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@ -678,8 +678,9 @@ static int tegra_adma_probe(struct platform_device *pdev)
return -ENODEV;
}
tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels *
sizeof(struct tegra_adma_chan), GFP_KERNEL);
tdma = devm_kzalloc(&pdev->dev,
struct_size(tdma, channels, cdata->nr_channels),
GFP_KERNEL);
if (!tdma)
return -ENOMEM;