Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-28 07:01:32 +00:00
Code Issues Packages Projects Releases Wiki Activity

i2c: mux: Use struct_size() in devm_kzalloc()

Browse Source 
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[];
};

instance = devm_kzalloc(dev, sizeof(struct foo) + count * sizeof(struct boo), 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: Peter Rosin <peda@axentia.se>
This commit is contained in:
Gustavo A. R. Silva 2019-05-29 11:20:14 -05:00 committed by Peter Rosin
parent cd6c84d8f0
commit 1f3b69b6b9
1 changed files with 1 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/i2c/i2c-mux.c
View File

@ -243,8 +243,7 @@ struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent,
{
struct i2c_mux_core *muxc;
muxc = devm_kzalloc(dev, sizeof(*muxc)
+ max_adapters * sizeof(muxc->adapter[0])
muxc = devm_kzalloc(dev, struct_size(muxc, adapter, max_adapters)
+ sizeof_priv, GFP_KERNEL);
if (!muxc)
return NULL;