Merge tag 'net-6.6-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Pull networking fixes from Paolo Abeni:
 "Including fixes from CAN and BPF.

  We have a regression in TC currently under investigation, otherwise
  the things that stand off most are probably the TCP and AF_PACKET
  fixes, with both issues coming from 6.5.

  Previous releases - regressions:

   - af_packet: fix fortified memcpy() without flex array.

   - tcp: fix crashes trying to free half-baked MTU probes

   - xdp: fix zero-size allocation warning in xskq_create()

   - can: sja1000: always restart the tx queue after an overrun

   - eth: mlx5e: again mutually exclude RX-FCS and RX-port-timestamp

   - eth: nfp: avoid rmmod nfp crash issues

   - eth: octeontx2-pf: fix page pool frag allocation warning

  Previous releases - always broken:

   - mctp: perform route lookups under a RCU read-side lock

   - bpf: s390: fix clobbering the caller's backchain in the trampoline

   - phy: lynx-28g: cancel the CDR check work item on the remove path

   - dsa: qca8k: fix qca8k driver for Turris 1.x

   - eth: ravb: fix use-after-free issue in ravb_tx_timeout_work()

   - eth: ixgbe: fix crash with empty VF macvlan list"

* tag 'net-6.6-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (54 commits)
  rswitch: Fix imbalance phy_power_off() calling
  rswitch: Fix renesas_eth_sw_remove() implementation
  octeontx2-pf: Fix page pool frag allocation warning
  nfc: nci: assert requested protocol is valid
  af_packet: Fix fortified memcpy() without flex array.
  net: tcp: fix crashes trying to free half-baked MTU probes
  net/smc: Fix pos miscalculation in statistics
  nfp: flower: avoid rmmod nfp crash issues
  net: usb: dm9601: fix uninitialized variable use in dm9601_mdio_read
  ethtool: Fix mod state of verbose no_mask bitset
  net: nfc: fix races in nfc_llcp_sock_get() and nfc_llcp_sock_get_sn()
  mctp: perform route lookups under a RCU read-side lock
  net: skbuff: fix kernel-doc typos
  s390/bpf: Fix unwinding past the trampoline
  s390/bpf: Fix clobbering the caller's backchain in the trampoline
  net/mlx5e: Again mutually exclude RX-FCS and RX-port-timestamp
  net/smc: Fix dependency of SMC on ISM
  ixgbe: fix crash with empty VF macvlan list
  net/mlx5e: macsec: use update_pn flag instead of PN comparation
  net: phy: mscc: macsec: reject PN update requests
  ...

1 files changed, 13 insertions, 2 deletions

diff --git a/drivers/net/dsa/qca/qca8k-8xxx.c b/drivers/net/dsa/qca/qca8k-8xxx.c
index de1dc22cf683..4ce68e655a63 100644
--- a/drivers/net/dsa/qca/qca8k-8xxx.c
+++ b/drivers/net/dsa/qca/qca8k-8xxx.c
@@ -505,8 +505,8 @@ qca8k_bulk_read(void *ctx, const void *reg_buf, size_t reg_len,
 		void *val_buf, size_t val_len)
 {
 	int i, count = val_len / sizeof(u32), ret;
-	u32 reg = *(u32 *)reg_buf & U16_MAX;
 	struct qca8k_priv *priv = ctx;
+	u32 reg = *(u16 *)reg_buf;
 
 	if (priv->mgmt_master &&
 	    !qca8k_read_eth(priv, reg, val_buf, val_len))
@@ -527,8 +527,8 @@ qca8k_bulk_gather_write(void *ctx, const void *reg_buf, size_t reg_len,
 			const void *val_buf, size_t val_len)
 {
 	int i, count = val_len / sizeof(u32), ret;
-	u32 reg = *(u32 *)reg_buf & U16_MAX;
 	struct qca8k_priv *priv = ctx;
+	u32 reg = *(u16 *)reg_buf;
 	u32 *val = (u32 *)val_buf;
 
 	if (priv->mgmt_master &&
@@ -666,6 +666,15 @@ qca8k_phy_eth_command(struct qca8k_priv *priv, bool read, int phy,
 		goto err_read_skb;
 	}
 
+	/* It seems that accessing the switch's internal PHYs via management
+	 * packets still uses the MDIO bus within the switch internally, and
+	 * these accesses can conflict with external MDIO accesses to other
+	 * devices on the MDIO bus.
+	 * We therefore need to lock the MDIO bus onto which the switch is
+	 * connected.
+	 */
+	mutex_lock(&priv->bus->mdio_lock);
+
 	/* Actually start the request:
 	 * 1. Send mdio master packet
 	 * 2. Busy Wait for mdio master command
@@ -678,6 +687,7 @@ qca8k_phy_eth_command(struct qca8k_priv *priv, bool read, int phy,
 	mgmt_master = priv->mgmt_master;
 	if (!mgmt_master) {
 		mutex_unlock(&mgmt_eth_data->mutex);
+		mutex_unlock(&priv->bus->mdio_lock);
 		ret = -EINVAL;
 		goto err_mgmt_master;
 	}
@@ -765,6 +775,7 @@ exit:
 				    QCA8K_ETHERNET_TIMEOUT);
 
 	mutex_unlock(&mgmt_eth_data->mutex);
+	mutex_unlock(&priv->bus->mdio_lock);
 
 	return ret;