[PATCH] dmaengine: tegra210-adma: Use struct_size() in devm_kzalloc()

[Gustavo A. R. Silva]

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 code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gust...@embeddedor.com>
---
 drivers/dma/tegra210-adma.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c
index b26256f23d67..5ec0dd97b397 100644
--- a/drivers/dma/tegra210-adma.c
+++ b/drivers/dma/tegra210-adma.c
@@ -678,8 +678,9 @@ static int tegra_adma_probe(struct platform_device *pdev)
                return -ENODEV;
        }
 
-       tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels *
-                           sizeof(struct tegra_adma_chan), GFP_KERNEL);
+       tdma = devm_kzalloc(&pdev->dev,
+                           struct_size(tdma, channels, cdata->nr_channels),
+                           GFP_KERNEL);
        if (!tdma)
                return -ENOMEM;
 
-- 
2.20.1