diff options
Diffstat (limited to 'target/linux/generic/backport-5.4/715-v5.3-net-phylink-don-t-start-and-stop-SGMII-PHYs-in-SFP-m.patch')
| -rw-r--r-- | target/linux/generic/backport-5.4/715-v5.3-net-phylink-don-t-start-and-stop-SGMII-PHYs-in-SFP-m.patch | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/715-v5.3-net-phylink-don-t-start-and-stop-SGMII-PHYs-in-SFP-m.patch b/target/linux/generic/backport-5.4/715-v5.3-net-phylink-don-t-start-and-stop-SGMII-PHYs-in-SFP-m.patch new file mode 100644 index 0000000000..94fb2fb3e4 --- /dev/null +++ b/target/linux/generic/backport-5.4/715-v5.3-net-phylink-don-t-start-and-stop-SGMII-PHYs-in-SFP-m.patch @@ -0,0 +1,141 @@ +From b8803113537a1c1f457eba6270d46e3af305031f Mon Sep 17 00:00:00 2001 +From: Arseny Solokha <asolokha@kb.kras.ru> +Date: Wed, 24 Jul 2019 20:31:39 +0700 +Subject: [PATCH 613/660] net: phylink: don't start and stop SGMII PHYs in SFP + modules twice + +SFP modules connected using the SGMII interface have their own PHYs which +are handled by the struct phylink's phydev field. On the other hand, for +the modules connected using 1000Base-X interface that field is not set. + +Since commit ce0aa27ff3f6 ("sfp: add sfp-bus to bridge between network +devices and sfp cages") phylink_start() ends up setting the phydev field +using the sfp-bus infrastructure, which eventually calls phy_start() on it, +and then calling phy_start() again on the same phydev from phylink_start() +itself. Similar call sequence holds for phylink_stop(), only in the reverse +order. This results in WARNs during network interface bringup and shutdown +when a copper SFP module is connected, as phy_start() and phy_stop() are +called twice in a row for the same phy_device: + + % ip link set up dev eth0 + ------------[ cut here ]------------ + called from state UP + WARNING: CPU: 1 PID: 155 at drivers/net/phy/phy.c:895 phy_start+0x74/0xc0 + Modules linked in: + CPU: 1 PID: 155 Comm: backend Not tainted 5.2.0+ #1 + NIP: c0227bf0 LR: c0227bf0 CTR: c004d224 + REGS: df547720 TRAP: 0700 Not tainted (5.2.0+) + MSR: 00029000 <CE,EE,ME> CR: 24002822 XER: 00000000 + + GPR00: c0227bf0 df5477d8 df5d7080 00000014 df9d2370 df9d5ac4 1f4eb000 00000001 + GPR08: c061fe58 00000000 00000000 df5477d8 0000003c 100c8768 00000000 00000000 + GPR16: df486a00 c046f1c8 c046eea0 00000000 c046e904 c0239604 db68449c 00000000 + GPR24: e9083204 00000000 00000001 db684460 e9083404 00000000 db6dce00 db6dcc00 + NIP [c0227bf0] phy_start+0x74/0xc0 + LR [c0227bf0] phy_start+0x74/0xc0 + Call Trace: + [df5477d8] [c0227bf0] phy_start+0x74/0xc0 (unreliable) + [df5477e8] [c023cad0] startup_gfar+0x398/0x3f4 + [df547828] [c023cf08] gfar_enet_open+0x364/0x374 + [df547898] [c029d870] __dev_open+0xe4/0x140 + [df5478c8] [c029db70] __dev_change_flags+0xf0/0x188 + [df5478f8] [c029dc28] dev_change_flags+0x20/0x54 + [df547918] [c02ae304] do_setlink+0x310/0x818 + [df547a08] [c02b1eb8] __rtnl_newlink+0x384/0x6b0 + [df547c28] [c02b222c] rtnl_newlink+0x48/0x68 + [df547c48] [c02ad7c8] rtnetlink_rcv_msg+0x240/0x27c + [df547c98] [c02cc068] netlink_rcv_skb+0x8c/0xf0 + [df547cd8] [c02cba3c] netlink_unicast+0x114/0x19c + [df547d08] [c02cbd74] netlink_sendmsg+0x2b0/0x2c0 + [df547d58] [c027b668] sock_sendmsg_nosec+0x20/0x40 + [df547d68] [c027d080] ___sys_sendmsg+0x17c/0x1dc + [df547e98] [c027df7c] __sys_sendmsg+0x68/0x84 + [df547ef8] [c027e430] sys_socketcall+0x1a0/0x204 + [df547f38] [c000d1d8] ret_from_syscall+0x0/0x38 + --- interrupt: c01 at 0xfd4e030 + LR = 0xfd4e010 + Instruction dump: + 813f0188 38800000 2b890005 419d0014 3d40c046 5529103a 394aa208 7c8a482e + 3c60c046 3863a1b8 4cc63182 4be009a1 <0fe00000> 48000030 3c60c046 3863a1d0 + ---[ end trace d4c095aeaf6ea998 ]--- + +and + + % ip link set down dev eth0 + ------------[ cut here ]------------ + called from state HALTED + WARNING: CPU: 1 PID: 184 at drivers/net/phy/phy.c:858 phy_stop+0x3c/0x88 + + <...> + + Call Trace: + [df581788] [c0228450] phy_stop+0x3c/0x88 (unreliable) + [df581798] [c022d548] sfp_sm_phy_detach+0x1c/0x44 + [df5817a8] [c022e8cc] sfp_sm_event+0x4b0/0x87c + [df581848] [c022f04c] sfp_upstream_stop+0x34/0x44 + [df581858] [c0225608] phylink_stop+0x7c/0xe4 + [df581868] [c023c57c] stop_gfar+0x7c/0x94 + [df581888] [c023c5b8] gfar_close+0x24/0x94 + [df5818a8] [c0298688] __dev_close_many+0xdc/0xf8 + [df5818c8] [c029db58] __dev_change_flags+0xd8/0x188 + [df5818f8] [c029dc28] dev_change_flags+0x20/0x54 + [df581918] [c02ae304] do_setlink+0x310/0x818 + [df581a08] [c02b1eb8] __rtnl_newlink+0x384/0x6b0 + [df581c28] [c02b222c] rtnl_newlink+0x48/0x68 + [df581c48] [c02ad7c8] rtnetlink_rcv_msg+0x240/0x27c + [df581c98] [c02cc068] netlink_rcv_skb+0x8c/0xf0 + [df581cd8] [c02cba3c] netlink_unicast+0x114/0x19c + [df581d08] [c02cbd74] netlink_sendmsg+0x2b0/0x2c0 + [df581d58] [c027b668] sock_sendmsg_nosec+0x20/0x40 + [df581d68] [c027d080] ___sys_sendmsg+0x17c/0x1dc + [df581e98] [c027df7c] __sys_sendmsg+0x68/0x84 + [df581ef8] [c027e430] sys_socketcall+0x1a0/0x204 + [df581f38] [c000d1d8] ret_from_syscall+0x0/0x38 + + <...> + + ---[ end trace d4c095aeaf6ea999 ]--- + +SFP modules with the 1000Base-X interface are not affected. + +Place explicit calls to phy_start() and phy_stop() before enabling or after +disabling an attached SFP module, where phydev is not yet set (or is +already unset), so they will be made only from the inside of sfp-bus, if +needed. + +Fixes: 217962615662 ("net: phy: warn if phy_start is called from invalid state") +Signed-off-by: Arseny Solokha <asolokha@kb.kras.ru> +Acked-by: Russell King <rmk+kernel@armlinux.org.uk> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + drivers/net/phy/phylink.c | 8 ++++---- + 1 file changed, 4 insertions(+), 4 deletions(-) + +--- a/drivers/net/phy/phylink.c ++++ b/drivers/net/phy/phylink.c +@@ -973,10 +973,10 @@ void phylink_start(struct phylink *pl) + } + if (pl->link_an_mode == MLO_AN_FIXED && pl->get_fixed_state) + mod_timer(&pl->link_poll, jiffies + HZ); +- if (pl->sfp_bus) +- sfp_upstream_start(pl->sfp_bus); + if (pl->phydev) + phy_start(pl->phydev); ++ if (pl->sfp_bus) ++ sfp_upstream_start(pl->sfp_bus); + } + EXPORT_SYMBOL_GPL(phylink_start); + +@@ -993,10 +993,10 @@ void phylink_stop(struct phylink *pl) + { + ASSERT_RTNL(); + +- if (pl->phydev) +- phy_stop(pl->phydev); + if (pl->sfp_bus) + sfp_upstream_stop(pl->sfp_bus); ++ if (pl->phydev) ++ phy_stop(pl->phydev); + del_timer_sync(&pl->link_poll); + if (pl->link_irq) { + free_irq(pl->link_irq, pl); |