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dmaengine: qcom: bam_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 2019-01-04 11:32:15 -06:00 • committed by Vinod Koul
parent a474b3f042
commit edd3c38999
1 changed files with 2 additions and 2 deletions
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4
drivers/dma/qcom/bam_dma.c
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@ -636,8 +636,8 @@ static struct dma_async_tx_descriptor *bam_prep_slave_sg(struct dma_chan *chan,
num_alloc += DIV_ROUND_UP(sg_dma_len(sg), BAM_FIFO_SIZE); num_alloc += DIV_ROUND_UP(sg_dma_len(sg), BAM_FIFO_SIZE);
/* allocate enough room to accomodate the number of entries */ /* allocate enough room to accomodate the number of entries */
async_desc = kzalloc(sizeof(*async_desc) + async_desc = kzalloc(struct_size(async_desc, desc, num_alloc),
(num_alloc * sizeof(struct bam_desc_hw)), GFP_NOWAIT); GFP_NOWAIT);
if (!async_desc) if (!async_desc)
goto err_out; goto err_out;