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video: fbdev-MMP: 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;
    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);

Notice that, in this case, variable size is not necessary, hence it
is removed.

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <[email protected]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[email protected]>
This commit is contained in:
Gustavo A. R. Silva 2019-06-21 15:13:14 +02:00 • committed by Bartlomiej Zolnierkiewicz
commit b27b0017ef
1 changed files with 4 additions and 4 deletions
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8
drivers/video/fbdev/mmp/hw/mmp_ctrl.c
View file

@ -433,7 +433,7 @@ static int mmphw_probe(struct platform_device *pdev)
{
struct mmp_mach_plat_info *mi;
struct resource *res;
int ret, i, size, irq;
int ret, i, irq;
struct mmphw_path_plat *path_plat;
struct mmphw_ctrl *ctrl = NULL;
@ -461,9 +461,9 @@ static int mmphw_probe(struct platform_device *pdev)
}
/* allocate */
size = sizeof(struct mmphw_ctrl) + sizeof(struct mmphw_path_plat) *
mi->path_num;
ctrl = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
ctrl = devm_kzalloc(&pdev->dev,
struct_size(ctrl, path_plats, mi->path_num),
GFP_KERNEL);
if (!ctrl) {
ret = -ENOMEM;
goto failed;