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dma-mapping: benchmark: avoid needless copy_to_user if benchmark fails

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[ Upstream commit f7c9ccaadf ]

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

Suggested-by: Barry Song <21cnbao@gmail.com>
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Fedor Pchelkin 2024-05-04 14:47:02 +03:00 committed by Greg Kroah-Hartman
parent e6e1eda06b
commit 39d31edcf9
1 changed files with 3 additions and 0 deletions
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3
kernel/dma/map_benchmark.c
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@ -256,6 +256,9 @@ static long map_benchmark_ioctl(struct file *file, unsigned int cmd,
* dma_mask changed by benchmark * dma_mask changed by benchmark
*/ */
dma_set_mask(map->dev, old_dma_mask); dma_set_mask(map->dev, old_dma_mask);
if (ret)
return ret;
break; break;
default: default:
return -EINVAL; return -EINVAL;