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leds: is31fl32xx: Use struct_size() helper

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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 is31fl32xx_priv {
	...
        struct is31fl32xx_led_data leds[0];
};

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

So, replace the following function:

static inline size_t sizeof_is31fl32xx_priv(int num_leds)
{
       return sizeof(struct is31fl32xx_priv) +
                     (sizeof(struct is31fl32xx_led_data) * num_leds);
}

with:

struct_size(priv, leds, count)

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
Gustavo A. R. Silva 2019-08-30 13:14:48 -05:00 committed by Jacek Anaszewski
parent 2637fd436c
commit 1669ec78b8
1 changed files with 1 additions and 7 deletions
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8
drivers/leds/leds-is31fl32xx.c
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@ -324,12 +324,6 @@ static int is31fl32xx_init_regs(struct is31fl32xx_priv *priv)
return 0;
}
static inline size_t sizeof_is31fl32xx_priv(int num_leds)
{
return sizeof(struct is31fl32xx_priv) +
(sizeof(struct is31fl32xx_led_data) * num_leds);
}
static int is31fl32xx_parse_child_dt(const struct device *dev,
const struct device_node *child,
struct is31fl32xx_led_data *led_data)
@ -450,7 +444,7 @@ static int is31fl32xx_probe(struct i2c_client *client,
if (!count)
return -EINVAL;
priv = devm_kzalloc(dev, sizeof_is31fl32xx_priv(count),
priv = devm_kzalloc(dev, struct_size(priv, leds, count),
GFP_KERNEL);
if (!priv)
return -ENOMEM;