[Bug 268393] system always reboots once from a powered off state

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268393

--- Comment #63 from Ivan Rozhuk <rozhuk.im@gmail.com> ---
Why no one suggest patch like this?

diff --git a/sys/dev/sound/pci/hda/hdac.c b/sys/dev/sound/pci/hda/hdac.c
index 82b1baacfa9..f7be436aef6 100644
--- a/sys/dev/sound/pci/hda/hdac.c
+++ b/sys/dev/sound/pci/hda/hdac.c
@@ -956,6 +956,8 @@ hdac_rirb_flush(struct hdac_softc *sc)
        int ret;

        rirb_base = (struct hdac_rirb *)sc->rirb_dma.dma_vaddr;
+       if (rirb_base == NULL)
+               return (0);
        rirbwp = HDAC_READ_1(&sc->mem, HDAC_RIRBWP);
        bus_dmamap_sync(sc->rirb_dma.dma_tag, sc->rirb_dma.dma_map,
            BUS_DMASYNC_POSTREAD);
@@ -965,6 +967,8 @@ hdac_rirb_flush(struct hdac_softc *sc)
                sc->rirb_rp++;
                sc->rirb_rp %= sc->rirb_size;
                rirb = &rirb_base[sc->rirb_rp];
+               if (rirb == NULL)
+                       break;
                resp = le32toh(rirb->response);
                resp_ex = le32toh(rirb->response_ex);
                cad = HDAC_RIRB_RESPONSE_EX_SDATA_IN(resp_ex);

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