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authorGustavo A. R. Silva <gustavo@embeddedor.com>2019-04-10 12:09:14 -0500
committerThomas Gleixner <tglx@linutronix.de>2019-04-16 21:54:03 +0200
commit2d65c42b43e53d61f1fd6b8d0a097451a4cffa24 (patch)
tree3c6f04610b24a5bf4b1d4b585dff88dd42c848b9 /kernel/irq/devres.c
parentbbba0e7c5cdadb47a91edea1d5cd0caadbbb016f (diff)
downloadlinux-stericsson-2d65c42b43e53d61f1fd6b8d0a097451a4cffa24.tar.gz
genirq/devres: 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); This code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190410170914.GA16161@embeddedor
Diffstat (limited to 'kernel/irq/devres.c')
-rw-r--r--kernel/irq/devres.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
index f808c6a97dcc..f6e5515ee077 100644
--- a/kernel/irq/devres.c
+++ b/kernel/irq/devres.c
@@ -220,9 +220,8 @@ devm_irq_alloc_generic_chip(struct device *dev, const char *name, int num_ct,
irq_flow_handler_t handler)
{
struct irq_chip_generic *gc;
- unsigned long sz = sizeof(*gc) + num_ct * sizeof(struct irq_chip_type);
- gc = devm_kzalloc(dev, sz, GFP_KERNEL);
+ gc = devm_kzalloc(dev, struct_size(gc, chip_types, num_ct), GFP_KERNEL);
if (gc)
irq_init_generic_chip(gc, name, num_ct,
irq_base, reg_base, handler);