From: Fedor Pchelkin pchelkin@ispras.ru
[ Upstream commit f7c9ccaadffd13066353332c13d7e9bf73b8f92d ]
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 --- 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 02205ab53b7e9..28ca165cb62c1 100644 --- a/kernel/dma/map_benchmark.c +++ b/kernel/dma/map_benchmark.c @@ -252,6 +252,9 @@ 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;