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dmaengine: st_fdma: 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>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2019-01-04 12:43:22 -06:00 committed by Vinod Koul
parent ed414d5803
commit 55f53b9c17
1 changed files with 1 additions and 2 deletions
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3
drivers/dma/st_fdma.c
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@ -243,8 +243,7 @@ static struct st_fdma_desc *st_fdma_alloc_desc(struct st_fdma_chan *fchan,
struct st_fdma_desc *fdesc;
int i;
fdesc = kzalloc(sizeof(*fdesc) +
sizeof(struct st_fdma_sw_node) * sg_len, GFP_NOWAIT);
fdesc = kzalloc(struct_size(fdesc, node, sg_len), GFP_NOWAIT);
if (!fdesc)
return NULL;