net: phy: unregister SFP upstream before port cleanup

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Commit 4497f50286 ("net: phy: Clean the phy_ports after unregistering
the downstream SFP bus") established that an SFP upstream must be
unregistered before its phy_ports are destroyed because SFP callbacks
may access these ports.

phy_setup_ports() does not follow this order when a later port setup
step fails after phy_sfp_probe() succeeds. It destroys the SFP phy_port
and leaves phy_probe() to unregister the upstream later, creating a race
between port destruction and SFP upstream callbacks.

The error unwind is also split across three functions. If
phy_setup_sfp_port() fails, phy_sfp_probe() leaves the upstream
registered and relies on phy_probe() to remove it after
phy_setup_ports() returns.

Make each layer unwind the resources it successfully set up. Unregister
only the upstream in phy_sfp_probe() when SFP port setup fails, since
the failed port has already been destroyed. Add phy_sfp_release() for a
successful SFP probe, and make phy_setup_ports() use it before cleaning
up the remaining ports. Once phy_setup_ports() has rolled back all port
setup, make phy_probe() skip this cleanup.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Xuanqiang Luo <luoxuanqiang@kylinos.cn>
Link: https://patch.msgid.link/20260823035600.188864-3-xuanqiang.luo@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

This commit is contained in:

Xuanqiang Luo 2026-08-23 11:55:56 +08:00 • committed by Jakub Kicinski

parent b6d201d971

commit f558204abc

1 changed files with 38 additions and 11 deletions

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drivers/net/phy/phy_device.c

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