From 833954a4e34ed090a8e2f3b3a8d4624002f29d30 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Fri, 4 Jan 2019 15:39:13 -0600 Subject: [PATCH] serial: max310x: 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; 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 code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/max310x.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c index eb040d8292a8..0a04c053654f 100644 --- a/drivers/tty/serial/max310x.c +++ b/drivers/tty/serial/max310x.c @@ -1197,8 +1197,7 @@ static int max310x_probe(struct device *dev, struct max310x_devtype *devtype, return PTR_ERR(regmap); /* Alloc port structure */ - s = devm_kzalloc(dev, sizeof(*s) + - sizeof(struct max310x_one) * devtype->nr, GFP_KERNEL); + s = devm_kzalloc(dev, struct_size(s, p, devtype->nr), GFP_KERNEL); if (!s) { dev_err(dev, "Error allocating port structure\n"); return -ENOMEM;