From: Davidlohr Bueso <dave@stgolabs.net>
Date: Mon, 11 Feb 2019 08:15:29 -0800
Subject: xsk: share the mmap_sem for page pinning
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Patch-mainline: v5.0
Git-commit: e451eb51068496054d071af10b3530af4002a4f4
References: bsc#1109837
Holding mmap_sem exclusively for a gup() is an overkill. Lets
share the lock and replace the gup call for gup_longterm(), as
it is better suited for the lifetime of the pinning.
Fixes: c0c77d8fb787 ("xsk: add user memory registration support sockopt")
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Bjorn Topel <bjorn.topel@intel.com>
Cc: Magnus Karlsson <magnus.karlsson@intel.com>
CC: netdev@vger.kernel.org
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
net/xdp/xdp_umem.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/net/xdp/xdp_umem.c
+++ b/net/xdp/xdp_umem.c
@@ -259,10 +259,10 @@ static int xdp_umem_pin_pages(struct xdp
if (!umem->pgs)
return -ENOMEM;
- down_write(¤t->mm->mmap_sem);
- npgs = get_user_pages(umem->address, umem->npgs,
- gup_flags, &umem->pgs[0], NULL);
- up_write(¤t->mm->mmap_sem);
+ down_read(¤t->mm->mmap_sem);
+ npgs = get_user_pages_longterm(umem->address, umem->npgs,
+ gup_flags, &umem->pgs[0], NULL);
+ up_read(¤t->mm->mmap_sem);
if (npgs != umem->npgs) {
if (npgs >= 0) {