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| author | DENG Qingfang <dqfext@gmail.com> | 2021-04-03 22:59:15 +0800 |
|---|---|---|
| committer | Hauke Mehrtens <hauke@hauke-m.de> | 2021-04-18 12:05:04 +0200 |
| commit | 6552f31acdb14bca5e6b51c82ef63fd08d3b7a9f (patch) | |
| tree | f6c758107d56ddd283499d38c8cb83829cec6055 /package/network/services | |
| parent | cc6ad94fb920a5577239d60d42d8f1ec8d9b668c (diff) | |
| download | upstream-6552f31acdb14bca5e6b51c82ef63fd08d3b7a9f.tar.gz upstream-6552f31acdb14bca5e6b51c82ef63fd08d3b7a9f.tar.bz2 upstream-6552f31acdb14bca5e6b51c82ef63fd08d3b7a9f.zip | |
ramips: mt7530 swconfig: fix race condition in register access
The mt7530_{r,w}32 operation over MDIO uses 3 mdiobus operations and
does not hold a lock, which causes a race condition when multiple
threads try to access a register, they may get unexpected results.
To avoid this, handle the MDIO lock manually, and use the unlocked
__mdiobus_{read,write} in the critical section.
This fixes the "Ghost VLAN" artifact[1] in MT7530/7621 when the VLAN
operation and the swconfig LED link status poll race between each other.
[1] https://forum.openwrt.org/t/mysterious-vlan-ids-on-mt7621-device/64495
Signed-off-by: DENG Qingfang <dqfext@gmail.com>
(cherry picked from commit f99c9cd9c4d4c49a676d678327546fd41690fe2a)
Diffstat (limited to 'package/network/services')
0 files changed, 0 insertions, 0 deletions