DENG Qingfang f99c9cd9c4 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>		2021-04-15 00:00:54 +08:00
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drivers	ramips: mt7530 swconfig: fix race condition in register access	2021-04-15 00:00:54 +08:00