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regulator: da9062: 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;
    struct boo entry[];
};

size = sizeof(struct foo) + count * sizeof(struct boo);
instance = alloc(size, GFP_KERNEL)

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

instance = alloc(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>
Acked-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2019-02-22 19:54:51 -06:00 committed by Mark Brown
parent 1ec9c179c0
commit 97b047e72b
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GPG Key ID: 24D68B725D5487D0
1 changed files with 2 additions and 4 deletions
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6
drivers/regulator/da9062-regulator.c
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@ -992,7 +992,6 @@ static int da9062_regulator_probe(struct platform_device *pdev)
struct regulator_config config = { };
const struct da9062_regulator_info *rinfo;
int irq, n, ret;
size_t size;
int max_regulators;
switch (chip->chip_type) {
@ -1010,9 +1009,8 @@ static int da9062_regulator_probe(struct platform_device *pdev)
}
/* Allocate memory required by usable regulators */
size = sizeof(struct da9062_regulators) +
max_regulators * sizeof(struct da9062_regulator);
regulators = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
regulators = devm_kzalloc(&pdev->dev, struct_size(regulators, regulator,
max_regulators), GFP_KERNEL);
if (!regulators)
return -ENOMEM;