aue(4): fix link flaps from MII bus
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Authored by rkitover_gmail.com on Jun 14 2026, 3:28 AM.

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Summary

A race condition in the MII layer causes spurious events, see:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252165

. Add a lock to serialize operations on the MII bus and skip ticks while
it is held.

I have tested this patch with my Belkin USB 10/100 Ethernet Adapter
F5D5050.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>

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rG FreeBSD src repository

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Build Status

Buildable 73859
Build 70742: arc lint + arc unit

Event Timeline

rkitover_gmail.com created this revision.Jun 14 2026, 3:28 AM

Herald added a subscriber: imp. · View Herald TranscriptJun 14 2026, 3:28 AM

rkitover_gmail.com requested review of this revision.Jun 14 2026, 3:28 AM

Harbormaster completed remote builds in B73859: Diff 179706.Jun 14 2026, 3:28 AM

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Harbormaster completed remote builds in B73860: Diff 179707.Jun 14 2026, 3:30 AM

rkitover_gmail.com added projects: USB, desktop.Jun 14 2026, 3:31 AM

rkitover_gmail.com mentioned this in D57566: aue(4): fix incorrect media detection.Jun 14 2026, 3:36 AM

rkitover_gmail.com mentioned this in D55631: axge: fix spurious link down from MII, frozen TX.

Revision Contents
Changeset List

Path

Size

sys/

dev/

usb/

net/

if_aue.c

25 lines

if_auereg.h

4 lines

Diff 179706

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sys/dev/usb/net/if_aue.c