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1c16b574c4
Backport the phy/phylink/sfp patches currently queued in netdev or in mainline necessary to support GPON popular modules, specifically to support Huawei and Nokia GPON modules. Signed-off-by: Russell King <linux@armlinux.org.uk> [jonas.gorski: include kernel version in file names, refresh patches] Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
142 lines
5.6 KiB
Diff
142 lines
5.6 KiB
Diff
From b8803113537a1c1f457eba6270d46e3af305031f Mon Sep 17 00:00:00 2001
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From: Arseny Solokha <asolokha@kb.kras.ru>
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Date: Wed, 24 Jul 2019 20:31:39 +0700
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Subject: [PATCH 613/660] net: phylink: don't start and stop SGMII PHYs in SFP
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modules twice
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SFP modules connected using the SGMII interface have their own PHYs which
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are handled by the struct phylink's phydev field. On the other hand, for
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the modules connected using 1000Base-X interface that field is not set.
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Since commit ce0aa27ff3f6 ("sfp: add sfp-bus to bridge between network
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devices and sfp cages") phylink_start() ends up setting the phydev field
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using the sfp-bus infrastructure, which eventually calls phy_start() on it,
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and then calling phy_start() again on the same phydev from phylink_start()
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itself. Similar call sequence holds for phylink_stop(), only in the reverse
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order. This results in WARNs during network interface bringup and shutdown
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when a copper SFP module is connected, as phy_start() and phy_stop() are
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called twice in a row for the same phy_device:
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% ip link set up dev eth0
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------------[ cut here ]------------
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called from state UP
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WARNING: CPU: 1 PID: 155 at drivers/net/phy/phy.c:895 phy_start+0x74/0xc0
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Modules linked in:
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CPU: 1 PID: 155 Comm: backend Not tainted 5.2.0+ #1
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NIP: c0227bf0 LR: c0227bf0 CTR: c004d224
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REGS: df547720 TRAP: 0700 Not tainted (5.2.0+)
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MSR: 00029000 <CE,EE,ME> CR: 24002822 XER: 00000000
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GPR00: c0227bf0 df5477d8 df5d7080 00000014 df9d2370 df9d5ac4 1f4eb000 00000001
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GPR08: c061fe58 00000000 00000000 df5477d8 0000003c 100c8768 00000000 00000000
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GPR16: df486a00 c046f1c8 c046eea0 00000000 c046e904 c0239604 db68449c 00000000
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GPR24: e9083204 00000000 00000001 db684460 e9083404 00000000 db6dce00 db6dcc00
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NIP [c0227bf0] phy_start+0x74/0xc0
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LR [c0227bf0] phy_start+0x74/0xc0
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Call Trace:
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[df5477d8] [c0227bf0] phy_start+0x74/0xc0 (unreliable)
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[df5477e8] [c023cad0] startup_gfar+0x398/0x3f4
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[df547828] [c023cf08] gfar_enet_open+0x364/0x374
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[df547898] [c029d870] __dev_open+0xe4/0x140
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[df5478c8] [c029db70] __dev_change_flags+0xf0/0x188
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[df5478f8] [c029dc28] dev_change_flags+0x20/0x54
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[df547918] [c02ae304] do_setlink+0x310/0x818
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[df547a08] [c02b1eb8] __rtnl_newlink+0x384/0x6b0
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[df547c28] [c02b222c] rtnl_newlink+0x48/0x68
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[df547c48] [c02ad7c8] rtnetlink_rcv_msg+0x240/0x27c
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[df547c98] [c02cc068] netlink_rcv_skb+0x8c/0xf0
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[df547cd8] [c02cba3c] netlink_unicast+0x114/0x19c
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[df547d08] [c02cbd74] netlink_sendmsg+0x2b0/0x2c0
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[df547d58] [c027b668] sock_sendmsg_nosec+0x20/0x40
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[df547d68] [c027d080] ___sys_sendmsg+0x17c/0x1dc
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[df547e98] [c027df7c] __sys_sendmsg+0x68/0x84
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[df547ef8] [c027e430] sys_socketcall+0x1a0/0x204
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[df547f38] [c000d1d8] ret_from_syscall+0x0/0x38
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--- interrupt: c01 at 0xfd4e030
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LR = 0xfd4e010
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Instruction dump:
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813f0188 38800000 2b890005 419d0014 3d40c046 5529103a 394aa208 7c8a482e
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3c60c046 3863a1b8 4cc63182 4be009a1 <0fe00000> 48000030 3c60c046 3863a1d0
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---[ end trace d4c095aeaf6ea998 ]---
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and
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% ip link set down dev eth0
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------------[ cut here ]------------
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called from state HALTED
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WARNING: CPU: 1 PID: 184 at drivers/net/phy/phy.c:858 phy_stop+0x3c/0x88
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<...>
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Call Trace:
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[df581788] [c0228450] phy_stop+0x3c/0x88 (unreliable)
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[df581798] [c022d548] sfp_sm_phy_detach+0x1c/0x44
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[df5817a8] [c022e8cc] sfp_sm_event+0x4b0/0x87c
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[df581848] [c022f04c] sfp_upstream_stop+0x34/0x44
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[df581858] [c0225608] phylink_stop+0x7c/0xe4
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[df581868] [c023c57c] stop_gfar+0x7c/0x94
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[df581888] [c023c5b8] gfar_close+0x24/0x94
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[df5818a8] [c0298688] __dev_close_many+0xdc/0xf8
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[df5818c8] [c029db58] __dev_change_flags+0xd8/0x188
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[df5818f8] [c029dc28] dev_change_flags+0x20/0x54
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[df581918] [c02ae304] do_setlink+0x310/0x818
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[df581a08] [c02b1eb8] __rtnl_newlink+0x384/0x6b0
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[df581c28] [c02b222c] rtnl_newlink+0x48/0x68
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[df581c48] [c02ad7c8] rtnetlink_rcv_msg+0x240/0x27c
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[df581c98] [c02cc068] netlink_rcv_skb+0x8c/0xf0
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[df581cd8] [c02cba3c] netlink_unicast+0x114/0x19c
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[df581d08] [c02cbd74] netlink_sendmsg+0x2b0/0x2c0
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[df581d58] [c027b668] sock_sendmsg_nosec+0x20/0x40
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[df581d68] [c027d080] ___sys_sendmsg+0x17c/0x1dc
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[df581e98] [c027df7c] __sys_sendmsg+0x68/0x84
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[df581ef8] [c027e430] sys_socketcall+0x1a0/0x204
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[df581f38] [c000d1d8] ret_from_syscall+0x0/0x38
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<...>
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---[ end trace d4c095aeaf6ea999 ]---
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SFP modules with the 1000Base-X interface are not affected.
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Place explicit calls to phy_start() and phy_stop() before enabling or after
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disabling an attached SFP module, where phydev is not yet set (or is
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already unset), so they will be made only from the inside of sfp-bus, if
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needed.
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Fixes: 217962615662 ("net: phy: warn if phy_start is called from invalid state")
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Signed-off-by: Arseny Solokha <asolokha@kb.kras.ru>
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Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/phy/phylink.c | 8 ++++----
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1 file changed, 4 insertions(+), 4 deletions(-)
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--- a/drivers/net/phy/phylink.c
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+++ b/drivers/net/phy/phylink.c
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@@ -973,10 +973,10 @@ void phylink_start(struct phylink *pl)
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}
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if (pl->link_an_mode == MLO_AN_FIXED && pl->get_fixed_state)
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mod_timer(&pl->link_poll, jiffies + HZ);
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- if (pl->sfp_bus)
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- sfp_upstream_start(pl->sfp_bus);
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if (pl->phydev)
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phy_start(pl->phydev);
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+ if (pl->sfp_bus)
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+ sfp_upstream_start(pl->sfp_bus);
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}
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EXPORT_SYMBOL_GPL(phylink_start);
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@@ -993,10 +993,10 @@ void phylink_stop(struct phylink *pl)
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{
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ASSERT_RTNL();
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- if (pl->phydev)
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- phy_stop(pl->phydev);
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if (pl->sfp_bus)
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sfp_upstream_stop(pl->sfp_bus);
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+ if (pl->phydev)
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+ phy_stop(pl->phydev);
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del_timer_sync(&pl->link_poll);
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if (pl->link_irq) {
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free_irq(pl->link_irq, pl);
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