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| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2019-04-10 20:09:14 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-04-16 22:54:03 +0300 |
| commit | 2d65c42b43e53d61f1fd6b8d0a097451a4cffa24 (patch) | |
| tree | 3c6f04610b24a5bf4b1d4b585dff88dd42c848b9 /kernel/irq | |
| parent | bbba0e7c5cdadb47a91edea1d5cd0caadbbb016f (diff) | |
| download | linux-2d65c42b43e53d61f1fd6b8d0a097451a4cffa24.tar.xz | |
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')
| -rw-r--r-- | kernel/irq/devres.c | 3 |
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); |