Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

Pull networking fixes from David Miller:

 1) Fix suspend and resume in mt76x0u USB driver, from Stanislaw
    Gruszka.

 2) Missing memory barriers in xsk, from Magnus Karlsson.

 3) rhashtable fixes in mac80211 from Herbert Xu.

 4) 32-bit MIPS eBPF JIT fixes from Paul Burton.

 5) Fix for_each_netdev_feature() on big endian, from Hauke Mehrtens.

 6) GSO validation fixes from Willem de Bruijn.

 7) Endianness fix for dwmac4 timestamp handling, from Alexandre Torgue.

 8) More strict checks in tcp_v4_err(), from Eric Dumazet.

 9) af_alg_release should NULL out the sk after the sock_put(), from Mao
    Wenan.

10) Missing unlock in mac80211 mesh error path, from Wei Yongjun.

11) Missing device put in hns driver, from Salil Mehta.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (44 commits)
  sky2: Increase D3 delay again
  vhost: correctly check the return value of translate_desc() in log_used()
  net: netcp: Fix ethss driver probe issue
  net: hns: Fixes the missing put_device in positive leg for roce reset
  net: stmmac: Fix a race in EEE enable callback
  qed: Fix iWARP syn packet mac address validation.
  qed: Fix iWARP buffer size provided for syn packet processing.
  r8152: Add support for MAC address pass through on RTL8153-BD
  mac80211: mesh: fix missing unlock on error in table_path_del()
  net/mlx4_en: fix spelling mistake: "quiting" -> "quitting"
  net: crypto set sk to NULL when af_alg_release.
  net: Do not allocate page fragments that are not skb aligned
  mm: Use fixed constant in page_frag_alloc instead of size + 1
  tcp: tcp_v4_err() should be more careful
  tcp: clear icsk_backoff in tcp_write_queue_purge()
  net: mv643xx_eth: disable clk on error path in mv643xx_eth_shared_probe()
  qmi_wwan: apply SET_DTR quirk to Sierra WP7607
  net: stmmac: handle endianness in dwmac4_get_timestamp
  doc: Mention MSG_ZEROCOPY implementation for UDP
  mlxsw: __mlxsw_sp_port_headroom_set(): Fix a use of local variable
  ...

2 files changed, 10 insertions, 5 deletions

diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
index d4de871e7d4d..37e1fe180769 100644
--- a/net/xdp/xdp_umem.c
+++ b/net/xdp/xdp_umem.c
@@ -125,9 +125,10 @@ int xdp_umem_assign_dev(struct xdp_umem *umem, struct net_device *dev,
 	return 0;
 
 err_unreg_umem:
-	xdp_clear_umem_at_qid(dev, queue_id);
 	if (!force_zc)
 		err = 0; /* fallback to copy mode */
+	if (err)
+		xdp_clear_umem_at_qid(dev, queue_id);
 out_rtnl_unlock:
 	rtnl_unlock();
 	return err;
@@ -259,10 +260,10 @@ static int xdp_umem_pin_pages(struct xdp_umem *umem)
 	if (!umem->pgs)
 		return -ENOMEM;
 
-	down_write(&current->mm->mmap_sem);
-	npgs = get_user_pages(umem->address, umem->npgs,
-			      gup_flags, &umem->pgs[0], NULL);
-	up_write(&current->mm->mmap_sem);
+	down_read(&current->mm->mmap_sem);
+	npgs = get_user_pages_longterm(umem->address, umem->npgs,
+				       gup_flags, &umem->pgs[0], NULL);
+	up_read(&current->mm->mmap_sem);
 
 	if (npgs != umem->npgs) {
 		if (npgs >= 0) {
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index a03268454a27..45f3b528dc09 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -669,6 +669,8 @@ static int xsk_mmap(struct file *file, struct socket *sock,
 		if (!umem)
 			return -EINVAL;
 
+		/* Matches the smp_wmb() in XDP_UMEM_REG */
+		smp_rmb();
 		if (offset == XDP_UMEM_PGOFF_FILL_RING)
 			q = READ_ONCE(umem->fq);
 		else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING)
@@ -678,6 +680,8 @@ static int xsk_mmap(struct file *file, struct socket *sock,
 	if (!q)
 		return -EINVAL;
 
+	/* Matches the smp_wmb() in xsk_init_queue */
+	smp_rmb();
 	qpg = virt_to_head_page(q->ring);
 	if (size > (PAGE_SIZE << compound_order(qpg)))
 		return -EINVAL;