Messages in this thread Patch in this message | | | Date | Thu, 23 Aug 2018 20:05:21 -0500 | From | "Gustavo A. R. Silva" <> | Subject | [PATCH] drm/sun4i: tcon-top: Use struct_size() in devm_kzalloc() |
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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 <gustavo@embeddedor.com> --- drivers/gpu/drm/sun4i/sun8i_tcon_top.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/sun4i/sun8i_tcon_top.c b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c index 55fe398..3040a79 100644 --- a/drivers/gpu/drm/sun4i/sun8i_tcon_top.c +++ b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c @@ -129,8 +129,7 @@ static int sun8i_tcon_top_bind(struct device *dev, struct device *master, if (!tcon_top) return -ENOMEM; - clk_data = devm_kzalloc(dev, sizeof(*clk_data) + - sizeof(*clk_data->hws) * CLK_NUM, + clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, CLK_NUM), GFP_KERNEL); if (!clk_data) return -ENOMEM; -- 2.7.4
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