From: Gustavo A. R. Silva Date: Wed, 29 May 2019 16:30:52 +0000 (-0500) Subject: eeprom: at24: use struct_size() in devm_kzalloc() X-Git-Tag: v5.15~5927^2~16^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9ae9d9bfb72ce43ab5851da55dd17c5f64e87151;p=platform%2Fkernel%2Flinux-starfive.git 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 Signed-off-by: Bartosz Golaszewski --- diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index fa730bb..8b07b18 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;