net: systemport: reset UniMAC coming out of a suspend cycle
bcm_sysport_resume() was missing an UniMAC reset which can lead to various receive FIFO corruptions coming out of a suspend cycle. If the RX FIFO is stuck, it will deliver corrupted/duplicate packets towards the host CPU interface. This could be reproduced on crowded network and when Wake-on-LAN is enabled for this particular interface because the switch still forwards packets towards the host CPU interface (SYSTEMPORT), and we had to leave the UniMAC RX enable bit on to allow matching MagicPackets. Once we re-enter the resume function, there is a small window during which the UniMAC receive is still enabled, and we start queueing packets, but the RDMA and RBUF engines are not ready, which leads to having packets stuck in the UniMAC RX FIFO, ultimately delivered towards the host CPU as corrupted. Fixes: 40755a0f ("net: systemport: add suspend and resume support") Signed-off-by:Florian Fainelli <f.fainelli@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
parent
8edf0047
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