skip dwqe_tx_proc() processing while the interface is not up

Prevents a crash seen by bluhm@ while running flood ping in parallel
to looping ifconfig dwqe0 down up:
kernel: protection fault trap, code=0
Stopped at      m_tag_delete_chain+0x30:        movq    0(%rsi),%rax

ok kettenis@ dlg@ patrick@ deraadt@

diff --git a/sys/dev/ic/dwqe.c b/sys/dev/ic/dwqe.c
index 97f874d..0467a4c 100644 (file)
--- a/sys/dev/ic/dwqe.c
+++ b/sys/dev/ic/dwqe.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: dwqe.c,v 1.17 2024/03/04 23:50:20 bluhm Exp $ */
+/*     $OpenBSD: dwqe.c,v 1.18 2024/03/29 08:19:40 stsp Exp $  */
 /*
  * Copyright (c) 2008, 2019 Mark Kettenis <kettenis@openbsd.org>
  * Copyright (c) 2017, 2022 Patrick Wildt <patrick@blueri.se>
@@ -593,6 +593,9 @@ dwqe_tx_proc(struct dwqe_softc *sc)
        struct dwqe_buf *txb;
        int idx, txfree;
 
+       if ((ifp->if_flags & IFF_RUNNING) == 0)
+               return;
+
        bus_dmamap_sync(sc->sc_dmat, DWQE_DMA_MAP(sc->sc_txring), 0,
            DWQE_DMA_LEN(sc->sc_txring),
            BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);