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linux-bredos/drivers/net
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Fiona Klute 689d5be94f net: phy: microchip: force IRQ polling mode for lan88xx 
commit 30a41ed32d upstream.

With lan88xx based devices the lan78xx driver can get stuck in an
interrupt loop while bringing the device up, flooding the kernel log
with messages like the following:

lan78xx 2-3:1.0 enp1s0u3: kevent 4 may have been dropped

Removing interrupt support from the lan88xx PHY driver forces the
driver to use polling instead, which avoids the problem.

The issue has been observed with Raspberry Pi devices at least since
4.14 (see [1], bug report for their downstream kernel), as well as
with Nvidia devices [2] in 2020, where disabling interrupts was the
vendor-suggested workaround (together with the claim that phylib
changes in 4.9 made the interrupt handling in lan78xx incompatible).

Iperf reports well over 900Mbits/sec per direction with client in
--dualtest mode, so there does not seem to be a significant impact on
throughput (lan88xx device connected via switch to the peer).

[1] https://github.com/raspberrypi/linux/issues/2447
[2] https://forums.developer.nvidia.com/t/jetson-xavier-and-lan7800-problem/142134/11

Link: https://lore.kernel.org/0901d90d-3f20-4a10-b680-9c978e04ddda@lunn.ch
Fixes: 792aec47d5 ("add microchip LAN88xx phy driver")
Signed-off-by: Fiona Klute <fiona.klute@gmx.de>
Cc: kernel-list@raspberrypi.com
Cc: stable@vger.kernel.org
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20250416102413.30654-1-fiona.klute@gmx.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-05-02 07:50:46 +02:00
..
appletalk
…
arcnet
arcnet: Add NULL check in com20020pci_probe()
2025-04-10 14:37:40 +02:00
bonding
bonding: fix incorrect MAC address setting to receive NS messages
2025-03-22 12:50:39 -07:00
caif
caif_virtio: fix wrong pointer check in cfv_probe()
2025-03-13 12:58:29 +01:00
can
can: flexcan: disable transceiver during system PM
2025-03-28 21:59:54 +01:00
dsa
net: dsa: mt7530: sync driver-specific behavior of MT7531 variants
2025-05-02 07:50:44 +02:00
ethernet
pds_core: make wait_context part of q_info
2025-05-02 07:50:44 +02:00
fddi
…
fjes
…
hamradio
…
hippi
…
hyperv
hv_netvsc: Fix VF namespace also in synthetic NIC NETDEV_REGISTER event
2024-11-01 01:58:33 +01:00
ieee802154
ieee802154: ca8210: Add missing check for kfifo_alloc() in ca8210_probe()
2025-01-17 13:36:11 +01:00
ipa
net: ipa: Enable checksum for IPA_ENDPOINT_AP_MODEM_{RX,TX} for v4.7
2025-03-13 12:58:31 +01:00
ipvlan
ipvlan: ensure network headers are in skb linear part
2025-03-07 16:45:40 +01:00
mctp
net: mctp i2c: Copy headers if cloned
2025-03-22 12:50:38 -07:00
mdio
net: mdiobus: fix an OF node reference leak
2024-12-27 13:58:49 +01:00
netdevsim
netdevsim: print human readable IP address
2025-02-21 13:57:25 +01:00
pcs
net: pcs: xpcs: fix the wrong register that was written back
2024-10-10 11:57:58 +02:00
phy
net: phy: microchip: force IRQ polling mode for lan88xx
2025-05-02 07:50:46 +02:00
plip
net: plip: fix break; causing plip to never transmit
2024-11-01 01:58:29 +01:00
ppp
net: ppp: Add bound checking for skb data on ppp_sync_txmung
2025-04-25 10:45:09 +02:00
pse-pd
…
slip
slip: make slhc_remember() more robust against malicious packets
2024-10-17 15:24:30 +02:00
team
team: better TEAM_OPTION_TYPE_STRING validation
2025-02-21 13:57:07 +01:00
thunderbolt
…
usb
cdc_ether|r8152: ThinkPad Hybrid USB-C/A Dock quirk
2025-04-25 10:45:16 +02:00
vmxnet3
vmxnet3: Fix tx queue race condition with XDP
2025-02-17 09:40:12 +01:00
vxlan
vxlan: check vxlan_vnigroup_init() return value
2025-02-21 13:57:07 +01:00
wan
…
wireguard
wireguard: send: annotate intentional data race in checking empty queue
2024-07-18 13:21:23 +02:00
wireless
wifi: rtw89: pci: disable PCIE wake bit when PCIE deinit
2025-04-25 10:45:57 +02:00
wwan
net: wwan: mhi_wwan_mbim: Silence sequence number glitch errors
2025-03-22 12:50:43 -07:00
xen-netback
net/xen-netback: prevent UAF in xenvif_flush_hash()
2024-10-10 11:57:22 +02:00
amt.c
…
bareudp.c
bareudp: Pull inner IP header on xmit.
2024-10-04 16:28:58 +02:00
dummy.c
…
eql.c
…
geneve.c
geneve: Suppress list corruption splat in geneve_destroy_tunnels().
2025-02-27 04:10:49 -08:00
gtp.c
gtp: Suppress list corruption splat in gtp_net_exit_batch_rtnl().
2025-02-27 04:10:49 -08:00
ifb.c
…
Kconfig
…
LICENSE.SRC
…
loopback.c
net: loopback: Avoid sending IP packets without an Ethernet header
2025-03-07 16:45:38 +01:00
macsec.c
macsec: Fix use-after-free while sending the offloading packet
2024-11-08 16:28:18 +01:00
macvlan.c
…
macvtap.c
…
Makefile
…
mdio.c
…
mhi_net.c
…
mii.c
…
net_failover.c
…
netconsole.c
net: netconsole: Disable target before netpoll cleanup
2024-08-03 08:54:13 +02:00
nlmon.c
…
ntb_netdev.c
net: ntb_netdev: Move ntb_netdev_rx_handler() to call netif_rx() from __netif_rx()
2024-07-11 12:49:13 +02:00
rionet.c
…
sb1000.c
…
Space.c
…
sungem_phy.c
…
tap.c
tap: add missing verification for short frame
2024-07-27 11:34:11 +02:00
tun.c
tun: revert fix group permission check
2025-02-17 09:40:14 +01:00
veth.c
…
virtio_net.c
virtio-net: fix overflow inside virtnet_rq_alloc
2024-12-14 20:00:07 +01:00
vrf.c
ipv6: introduce dst_rt6_info() helper
2024-12-14 19:59:35 +01:00
vsockmon.c
…
xen-netfront.c
xen-netfront: handle NULL returned by xdp_convert_buff_to_frame()
2025-05-02 07:50:46 +02:00