From owner-freebsd-hackers@FreeBSD.ORG  Fri Jan 12 14:37:41 2007
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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Fri, 12 Jan 2007 14:37:09 +0100
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Subject: mii_bus problem
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Hi,

Can someone here explain from where I can call "mii_pollstat()". I read 
somewhere on the internet that I cannot call this function from the so called 
"tick" routine, where "mii_tick()" is called. I currently have the following 
code:

static void
aue_cfg_tick(struct aue_softc *sc,
             struct aue_config_copy *cc, u_int16_t refcount)
{
        printf("%s:%d\n", __FUNCTION__, __LINE__);

        struct ifnet * ifp = sc->sc_ifp;
        struct mii_data * mii = GET_MII(sc);

        if ((cc == NULL) ||
            (ifp == NULL) || 
            (mii == NULL)) {
            /* not ready */
            return;
        }

        mii_tick(mii);

        mii_pollstat(mii);

        if ((sc->sc_flags & AUE_FLAG_WAIT_LINK) &&
            (mii->mii_media_status & IFM_ACTIVE) &&
            (IFM_SUBTYPE(mii->mii_media_active) != IFM_NONE)) {
            sc->sc_flags &= ~AUE_FLAG_WAIT_LINK;
        }

        sc->sc_media_active = mii->mii_media_active;
        sc->sc_media_status = mii->mii_media_status;

        /* start stopped transfers, if any */

        aue_start_transfers(sc);

        return;
}


But after this function returns, the kernel corrupts, and it pagefaults in the 
"swi6 taskqueue". Commenting out "mii_pollstat()" fixes the kernel panic.

My ifmedia status callback looks like this:

static void
aue_ifmedia_sts_cb(struct ifnet *ifp, struct ifmediareq *ifmr)
{
        printf("%s:%d\n", __FUNCTION__, __LINE__);

        struct aue_softc *sc = ifp->if_softc;

        mtx_lock(&(sc->sc_mtx));

        //mii_pollstat(mii); I don't want this here hence it sleeps!
        ifmr->ifm_active = sc->sc_media_active;
        ifmr->ifm_status = sc->sc_media_status;

        mtx_unlock(&(sc->sc_mtx));

        return;
}

The question is, is it at all possible to poll the MII status outside the 
ifmedia status callback ? And if yes, how?

Thanks
--HPS