17 Sep
2025
17 Sep
'25
6:58 p.m.
On Wed, Sep 17, 2025 at 11:54:57AM +0200, Oleksij Rempel wrote:
Forbid USB runtime PM (autosuspend) for AX88772* in bind.
[...]
With autosuspend active, resume paths may require calling phylink/phylib (caller must hold RTNL) and doing MDIO I/O. Taking RTNL from a USB PM resume can deadlock (RTNL may already be held), and MDIO can attempt a runtime-wake while the USB PM lock is held.
FWIW, for smsc95xx.c, the MDIO deadlock issue was resolved by commit 7b960c967f2a ("usbnet: smsc95xx: Fix deadlock on runtime resume"). I would assume that something similar would be possible for asix_devices.c as well.
Thanks,
Lukas