[PATCH] mtd: rawnand: atmel: 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;
        void *entry[];
};

instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, 
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);

This issue was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gust...@embeddedor.com>
---
 drivers/mtd/nand/raw/atmel/nand-controller.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c 
b/drivers/mtd/nand/raw/atmel/nand-controller.c
index a068b21..b17cfd0 100644
--- a/drivers/mtd/nand/raw/atmel/nand-controller.c
+++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
@@ -1586,9 +1586,7 @@ static struct atmel_nand *atmel_nand_create(struct 
atmel_nand_controller *nc,
                return ERR_PTR(-EINVAL);
        }
 
-       nand = devm_kzalloc(nc->dev,
-                           sizeof(*nand) + (numcs * sizeof(*nand->cs)),
-                           GFP_KERNEL);
+       nand = devm_kzalloc(nc->dev, struct_size(nand, cs, numcs), GFP_KERNEL);
        if (!nand) {
                dev_err(nc->dev, "Failed to allocate NAND object\n");
                return ERR_PTR(-ENOMEM);
-- 
2.7.4