From 162c820ed8965bf94d2685f97388aea5aee9e258 Mon Sep 17 00:00:00 2001 From: Ilya Maximets Date: Fri, 28 Jun 2019 11:04:06 +0300 Subject: [PATCH] xdp: hold device for umem regardless of zero-copy mode Device pointer stored in umem regardless of zero-copy mode, so we heed to hold the device in all cases. Fixes: c9b47cc1fabc ("xsk: fix bug when trying to use both copy and zero-copy on one queue id") Signed-off-by: Ilya Maximets Acked-by: Jonathan Lemon Signed-off-by: Daniel Borkmann --- net/xdp/xdp_umem.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c index 9c6de4f114f8..267b82a4cbcf 100644 --- a/net/xdp/xdp_umem.c +++ b/net/xdp/xdp_umem.c @@ -105,6 +105,9 @@ int xdp_umem_assign_dev(struct xdp_umem *umem, struct net_device *dev, umem->dev = dev; umem->queue_id = queue_id; + + dev_hold(dev); + if (force_copy) /* For copy-mode, we are done. */ goto out_rtnl_unlock; @@ -124,7 +127,6 @@ int xdp_umem_assign_dev(struct xdp_umem *umem, struct net_device *dev, goto err_unreg_umem; rtnl_unlock(); - dev_hold(dev); umem->zc = true; return 0; @@ -163,10 +165,9 @@ static void xdp_umem_clear_dev(struct xdp_umem *umem) xdp_clear_umem_at_qid(umem->dev, umem->queue_id); rtnl_unlock(); - if (umem->zc) { - dev_put(umem->dev); - umem->zc = false; - } + dev_put(umem->dev); + umem->dev = NULL; + umem->zc = false; } static void xdp_umem_unpin_pages(struct xdp_umem *umem) -- 2.30.2