linux-kernel - [PATCH] dmaengine: ep93xx: Use struct

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Message-Id: <36fa11d95b448b5f3f1677da41fe35b9e2751427.1690041500.git.christophe.jaillet@wanadoo.fr>
Date:   Sat, 22 Jul 2023 17:58:40 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        dmaengine@...r.kernel.org
Subject: [PATCH] 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@...adoo.fr>
---
It will also be helpful if the __counted_by() annotation is added with a
Coccinelle script such as:
   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?h=devel/counted_by&id=adc5b3cb48a049563dc673f348eab7b6beba8a9b
---
 drivers/dma/ep93xx_dma.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c
index 5338a94f1a69..5c4a448a1254 100644
--- 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;
 
-- 
2.34.1