linux-kernel - [PATCH v2 2/4] dma-mapping: benchmark: avoid needless copy_to

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Date: Sat,  4 May 2024 14:47:02 +0300
From: Fedor Pchelkin <pchelkin@...ras.ru>
To: Xiang Chen <chenxiang66@...ilicon.com>,
	Barry Song <21cnbao@...il.com>
Cc: Fedor Pchelkin <pchelkin@...ras.ru>,
	Christoph Hellwig <hch@....de>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	lvc-project@...uxtesting.org
Subject: [PATCH v2 2/4] dma-mapping: benchmark: avoid needless copy_to_user if benchmark fails

If do_map_benchmark() has failed, there is nothing useful to copy back
to userspace.

Suggested-by: Barry Song <21cnbao@...il.com>
Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>
---
 kernel/dma/map_benchmark.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/dma/map_benchmark.c b/kernel/dma/map_benchmark.c
index 2478957cf9f8..a6edb1ef98c8 100644
--- a/kernel/dma/map_benchmark.c
+++ b/kernel/dma/map_benchmark.c
@@ -256,6 +256,9 @@ static long map_benchmark_ioctl(struct file *file, unsigned int cmd,
 		 * dma_mask changed by benchmark
 		 */
 		dma_set_mask(map->dev, old_dma_mask);
+
+		if (ret)
+			return ret;
 		break;
 	default:
 		return -EINVAL;
-- 
2.45.0