6c55425cdb
possible to end up in the interrupt handler again while processing the previous RX interrupt in ifp->if_input() because the MD interrupt code disables the delivery of the respective interrupt until all associated handlers were called (in the INTR_FILTER case the MI code supposedly does the same). Toggling the NIC interrupt enable bit in these handlers still is necessary though as some chips (f.e. the VMware emulated one) require this to be done in order to keep issuing interrupts. MFC after: 1 month
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