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phy: samsung: 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 samsung_usb2_phy_driver {
	...
        struct samsung_usb2_phy_instance instances[0];
};

instance = devm_kzalloc(dev, sizeof(struct samsung_usb2_phy_driver) +
			count * sizeof(struct samsung_usb2_phy_instance),
			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, instances, 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: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Gustavo A. R. Silva 2019-06-05 15:00:02 -05:00 committed by Kishon Vijay Abraham I
parent 6ef72bc036
commit c886ec0256
1 changed files with 2 additions and 3 deletions
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5
drivers/phy/samsung/phy-samsung-usb2.c
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@ -159,9 +159,8 @@ static int samsung_usb2_phy_probe(struct platform_device *pdev)
if (!cfg)
return -EINVAL;
drv = devm_kzalloc(dev, sizeof(struct samsung_usb2_phy_driver) +
cfg->num_phys * sizeof(struct samsung_usb2_phy_instance),
GFP_KERNEL);
drv = devm_kzalloc(dev, struct_size(drv, instances, cfg->num_phys),
GFP_KERNEL);
if (!drv)
return -ENOMEM;