Sorry guys, I was confused: spin_lock() does not affect SR register. Thus, it seems fec_enet_tx is not responsible of interrupt priority issue. I think Juan Alberto's argument of interrupt level modification (due to scheduler?) may be true, perhaps. Then, the only way to control FEC's "interrupt flow" is to acknowledge the RX interrupt flag only after processing the input ring (i.e. patch solution). Does anybody have a better idea?
Claude
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