On Mon, Mar 04, 2019 at 03:58:15AM -0800, Ira Weiny wrote:
> On Mon, Mar 04, 2019 at 11:46:45AM -0800, john.hubb...@gmail.com wrote:
> > From: John Hubbard <jhubb...@nvidia.com>
> >
> > 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 <l...@kernel.org>
> > Cc: Ira Weiny <ira.we...@intel.com>
> > Cc: Jason Gunthorpe <j...@ziepe.ca>
> > Cc: Andrew Morton <a...@linux-foundation.org>
> > Cc: Doug Ledford <dledf...@redhat.com>
> > Cc: linux-r...@vger.kernel.org
> > Cc: linux...@kvack.org
> > Signed-off-by: John Hubbard <jhubb...@nvidia.com>
>
> I meant...
>
> Reviewed-by: Ira Weiny <ira.we...@intel.com>
>
> <sigh> just a bit too quick on the keyboard before lunch... ;-)
>
> Ira
I have this mapping in vimrc so i just have to do shift+!
map ! o
Reviewed-by: Yuval Shaia <yuval.sh...@oracle.com>
>
>
> > ---
> > 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
> >
