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dmaengine: timb_dma: Use struct_size() in 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 = kzalloc(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 = kzalloc(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: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Gustavo A. R. Silva
2019-01-08 09:58:52 -06:00
committed by Vinod Koul
parent 73bf95f57b
commit 3c215fd868
1 changed files with 2 additions and 2 deletions
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4
drivers/dma/timb_dma.c
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@@ -643,8 +643,8 @@ static int td_probe(struct platform_device *pdev)
DRIVER_NAME))
return -EBUSY;
td = kzalloc(sizeof(struct timb_dma) +
sizeof(struct timb_dma_chan) * pdata->nr_channels, GFP_KERNEL);
td = kzalloc(struct_size(td, channels, pdata->nr_channels),
GFP_KERNEL);
if (!td) {
err = -ENOMEM;
goto err_release_region;