From: John Hubbard <jhubbard@xxxxxxxxxx>
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.
Cc: Leon Romanovsky <leon@xxxxxxxxxx>
Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Doug Ledford <dledford@xxxxxxxxxx>
Cc: linux-rdma@xxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
---
drivers/infiniband/core/umem_odp.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c
index acb882f279cb..d45735b02e07 100644
--- a/drivers/infiniband/core/umem_odp.c
+++ b/drivers/infiniband/core/umem_odp.c
@@ -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>
@@ -684,9 +685,11 @@ 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;
}
}
--
2.21.0
