From mboxrd@z Thu Jan 1 00:00:00 1970 From: Leon Romanovsky Subject: [PATCH rdma-next V1 02/10] IB/mlx5: Fix function updating xlt emergency path Date: Wed, 5 Apr 2017 09:23:51 +0300 Message-ID: <20170405062359.26623-3-leon@kernel.org> References: <20170405062359.26623-1-leon@kernel.org> Return-path: In-Reply-To: <20170405062359.26623-1-leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Doug Ledford Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Artemy Kovalyov List-Id: linux-rdma@vger.kernel.org From: Artemy Kovalyov In memory shortage path we fall back to use spare buffer. mlx5_ib_update_xlt() called from ib_uverbs_reg_mr when ibmr.ucontext not initialized yet. Scenario how to test it: 1. trigger memory exhaustion so __get_free_pages(GFP_KERNEL, 4) will fail 2. register MR 3. there should be no kernel oops Fixes: 7d0cc6edcc70 ('IB/mlx5: Add MR cache for large UMR regions') Signed-off-by: Artemy Kovalyov Signed-off-by: Leon Romanovsky --- drivers/infiniband/hw/mlx5/mr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c index b8f9382a8b7d..1f09e11fa694 100644 --- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -1009,7 +1009,7 @@ int mlx5_ib_update_xlt(struct mlx5_ib_mr *mr, u64 idx, int npages, } if (!xlt) { - uctx = to_mucontext(mr->ibmr.uobject->context); + uctx = to_mucontext(mr->ibmr.pd->uobject->context); mlx5_ib_warn(dev, "Using XLT emergency buffer\n"); size = PAGE_SIZE; xlt = (void *)uctx->upd_xlt_page; -- 2.12.0 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html