dmaengine: ep93xx: Use struct_size()

Use struct_size() instead of hand-writing it, when allocating a structure
with a flex array.

This is less verbose, more robust and more informative.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/36fa11d95b448b5f3f1677da41fe35b9e2751427.1690041500.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c
index 5338a94..5c4a448 100644 (file)
--- a/drivers/dma/ep93xx_dma.c
+++ b/drivers/dma/ep93xx_dma.c
@@ -1320,11 +1320,9 @@ static int __init ep93xx_dma_probe(struct platform_device *pdev)
        struct ep93xx_dma_platform_data *pdata = dev_get_platdata(&pdev->dev);
        struct ep93xx_dma_engine *edma;
        struct dma_device *dma_dev;
-       size_t edma_size;
        int ret, i;
 
-       edma_size = pdata->num_channels * sizeof(struct ep93xx_dma_chan);
-       edma = kzalloc(sizeof(*edma) + edma_size, GFP_KERNEL);
+       edma = kzalloc(struct_size(edma, channels, pdata->num_channels), GFP_KERNEL);
        if (!edma)
                return -ENOMEM;