Merge tag 'net-6.7-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Pull networking fixes from Paolo Abeni:
"Current release - regressions:

   - tcp: fix tcp_disordered_ack() vs usec TS resolution

  Current release - new code bugs:

   - dpll: sanitize possible null pointer dereference in
     dpll_pin_parent_pin_set()

   - eth: octeon_ep: initialise control mbox tasks before using APIs

  Previous releases - regressions:

   - io_uring/af_unix: disable sending io_uring over sockets

   - eth: mlx5e:
       - TC, don't offload post action rule if not supported
       - fix possible deadlock on mlx5e_tx_timeout_work

   - eth: iavf: fix iavf_shutdown to call iavf_remove instead iavf_close

   - eth: bnxt_en: fix skb recycling logic in bnxt_deliver_skb()

   - eth: ena: fix DMA syncing in XDP path when SWIOTLB is on

   - eth: team: fix use-after-free when an option instance allocation
     fails

  Previous releases - always broken:

   - neighbour: don't let neigh_forced_gc() disable preemption for long

   - net: prevent mss overflow in skb_segment()

   - ipv6: support reporting otherwise unknown prefix flags in
     RTM_NEWPREFIX

   - tcp: remove acked SYN flag from packet in the transmit queue
     correctly

   - eth: octeontx2-af:
       - fix a use-after-free in rvu_nix_register_reporters
       - fix promisc mcam entry action

   - eth: dwmac-loongson: make sure MDIO is initialized before use

   - eth: atlantic: fix double free in ring reinit logic"

* tag 'net-6.7-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (62 commits)
  net: atlantic: fix double free in ring reinit logic
  appletalk: Fix Use-After-Free in atalk_ioctl
  net: stmmac: Handle disabled MDIO busses from devicetree
  net: stmmac: dwmac-qcom-ethqos: Fix drops in 10M SGMII RX
  dpaa2-switch: do not ask for MDB, VLAN and FDB replay
  dpaa2-switch: fix size of the dma_unmap
  net: prevent mss overflow in skb_segment()
  vsock/virtio: Fix unsigned integer wrap around in virtio_transport_has_space()
  Revert "tcp: disable tcp_autocorking for socket when TCP_NODELAY flag is set"
  MIPS: dts: loongson: drop incorrect dwmac fallback compatible
  stmmac: dwmac-loongson: drop useless check for compatible fallback
  stmmac: dwmac-loongson: Make sure MDIO is initialized before use
  tcp: disable tcp_autocorking for socket when TCP_NODELAY flag is set
  dpll: sanitize possible null pointer dereference in dpll_pin_parent_pin_set()
  net: ena: Fix XDP redirection error
  net: ena: Fix DMA syncing in XDP path when SWIOTLB is on
  net: ena: Fix xdp drops handling due to multibuf packets
  net: ena: Destroy correct number of xdp queues upon failure
  net: Remove acked SYN flag from packet in the transmit queue correctly
  qed: Fix a potential use-after-free in qed_cxt_tables_alloc
  ...

1 files changed, 24 insertions, 3 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index ea58c6917433..0c87ddb8a7a2 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -2731,6 +2731,7 @@ void mlx5e_close_channels(struct mlx5e_channels *chs)
 {
 	int i;
 
+	ASSERT_RTNL();
 	if (chs->ptp) {
 		mlx5e_ptp_close(chs->ptp);
 		chs->ptp = NULL;
@@ -3012,17 +3013,29 @@ void mlx5e_activate_priv_channels(struct mlx5e_priv *priv)
 	if (mlx5e_is_vport_rep(priv))
 		mlx5e_rep_activate_channels(priv);
 
+	set_bit(MLX5E_STATE_CHANNELS_ACTIVE, &priv->state);
+
 	mlx5e_wait_channels_min_rx_wqes(&priv->channels);
 
 	if (priv->rx_res)
 		mlx5e_rx_res_channels_activate(priv->rx_res, &priv->channels);
 }
 
+static void mlx5e_cancel_tx_timeout_work(struct mlx5e_priv *priv)
+{
+	WARN_ON_ONCE(test_bit(MLX5E_STATE_CHANNELS_ACTIVE, &priv->state));
+	if (current_work() != &priv->tx_timeout_work)
+		cancel_work_sync(&priv->tx_timeout_work);
+}
+
 void mlx5e_deactivate_priv_channels(struct mlx5e_priv *priv)
 {
 	if (priv->rx_res)
 		mlx5e_rx_res_channels_deactivate(priv->rx_res);
 
+	clear_bit(MLX5E_STATE_CHANNELS_ACTIVE, &priv->state);
+	mlx5e_cancel_tx_timeout_work(priv);
+
 	if (mlx5e_is_vport_rep(priv))
 		mlx5e_rep_deactivate_channels(priv);
 
@@ -4801,8 +4814,17 @@ static void mlx5e_tx_timeout_work(struct work_struct *work)
 	struct net_device *netdev = priv->netdev;
 	int i;
 
-	rtnl_lock();
-	mutex_lock(&priv->state_lock);
+	/* Take rtnl_lock to ensure no change in netdev->real_num_tx_queues
+	 * through this flow. However, channel closing flows have to wait for
+	 * this work to finish while holding rtnl lock too. So either get the
+	 * lock or find that channels are being closed for other reason and
+	 * this work is not relevant anymore.
+	 */
+	while (!rtnl_trylock()) {
+		if (!test_bit(MLX5E_STATE_CHANNELS_ACTIVE, &priv->state))
+			return;
+		msleep(20);
+	}
 
 	if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
 		goto unlock;
@@ -4821,7 +4843,6 @@ static void mlx5e_tx_timeout_work(struct work_struct *work)
 	}
 
 unlock:
-	mutex_unlock(&priv->state_lock);
 	rtnl_unlock();
 }