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RDMA/umem: minor bug fix in error handling path

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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>
This commit is contained in:
John Hubbard 2019-03-04 11:46:45 -08:00 committed by Jason Gunthorpe
parent 4e69cf1fe2
commit 75a3e6a3c1
1 changed files with 6 additions and 3 deletions
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9
drivers/infiniband/core/umem_odp.c
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@ -40,6 +40,7 @@
#include <linux/vmalloc.h>
#include <linux/hugetlb.h>
#include <linux/interval_tree_generic.h>
#include <linux/pagemap.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_umem.h>
@ -685,9 +686,11 @@ int ib_umem_odp_map_dma_pages(struct ib_umem_odp *umem_odp, u64 user_virt,
mutex_unlock(&umem_odp->umem_mutex);
if (ret < 0) {
/* Release left over pages when handling errors. */
for (++j; j < npages; ++j)
put_page(local_page_list[j]);
/*
* Release pages, starting at the the first page
* that experienced an error.
*/
release_pages(&local_page_list[j], npages - j);
break;
}
}