4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Artemy Kovalyov <artemyko@xxxxxxxxxxxx>
[ Upstream commit edf1a84fe37c51290e2c88154ecaf48dadff3d27 ]
In ib_umem structure npages holds original number of sg entries, while
nmap is number of DMA blocks returned by dma_map_sg.
Fixes: c5d76f130b28 ('IB/core: Add umem function to read data from user-space')
Signed-off-by: Artemy Kovalyov <artemyko@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/core/umem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -357,7 +357,7 @@ int ib_umem_copy_from(void *dst, struct
return -EINVAL;
}
- ret = sg_pcopy_to_buffer(umem->sg_head.sgl, umem->nmap, dst, length,
+ ret = sg_pcopy_to_buffer(umem->sg_head.sgl, umem->npages, dst, length,
offset + ib_umem_offset(umem));
if (ret < 0)