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RDMA/umem: minor bug fix in error handling path
1. Bug fix: fix an off by one error in the code that cleans up if it fails
to dma-map a page, after having done a get_user_pages_remote() on a
range of pages.
2. Refinement: for that same cleanup code, release_pages() is better than
put_page() in a loop.
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Acked-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>