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| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2019-05-29 11:30:52 -0500 |
|---|---|---|
| committer | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2019-05-31 09:06:52 +0200 |
| commit | 9ae9d9bfb72ce43ab5851da55dd17c5f64e87151 (patch) | |
| tree | eae504ac76fc8b0dfcf8a24a002d1c285a554a51 | |
| parent | a8806581241b69b3ae3199f47412c04de854c53a (diff) | |
| download | linux-9ae9d9bfb72ce43ab5851da55dd17c5f64e87151.tar.bz2 | |
eeprom: at24: use struct_size() in devm_kzalloc()
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 = devm_kzalloc(dev, size, 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);
Notice that, in this case, variable at24_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>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
| -rw-r--r-- | drivers/misc/eeprom/at24.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index fa730bb342e8..8b07b18e9759 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -566,7 +566,6 @@ static int at24_probe(struct i2c_client *client) unsigned int i, num_addresses; struct at24_data *at24; struct regmap *regmap; - size_t at24_size; bool writable; u8 test_byte; int err; @@ -650,8 +649,8 @@ static int at24_probe(struct i2c_client *client) if (IS_ERR(regmap)) return PTR_ERR(regmap); - at24_size = sizeof(*at24) + num_addresses * sizeof(struct at24_client); - at24 = devm_kzalloc(dev, at24_size, GFP_KERNEL); + at24 = devm_kzalloc(dev, struct_size(at24, client, num_addresses), + GFP_KERNEL); if (!at24) return -ENOMEM; |