[PATCH] eeprom: at24: use struct_size() in devm_kzalloc()

[Gustavo A. R. Silva]

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 <gust...@embeddedor.com>
---
 drivers/misc/eeprom/at24.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index ba8e73812644..78ba6b1917a8 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -568,7 +568,6 @@ 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;
@@ -652,8 +651,8 @@ 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;
 
-- 
2.21.0