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diff --git a/sys/dev/usb/net/if_ure.c b/sys/dev/usb/net/if_ure.c
--- a/sys/dev/usb/net/if_ure.c
+++ b/sys/dev/usb/net/if_ure.c
@@ -128,6 +128,7 @@
static miibus_readreg_t ure_miibus_readreg;
static miibus_writereg_t ure_miibus_writereg;
static miibus_statchg_t ure_miibus_statchg;
+static miibus_linkchg_t ure_miibus_linkchg;
static uether_fn_t ure_attach_post;
static uether_fn_t ure_init;
@@ -184,6 +185,7 @@
DEVMETHOD(miibus_readreg, ure_miibus_readreg),
DEVMETHOD(miibus_writereg, ure_miibus_writereg),
DEVMETHOD(miibus_statchg, ure_miibus_statchg),
+ DEVMETHOD(miibus_linkchg, ure_miibus_linkchg),
DEVMETHOD_END
};
@@ -442,7 +444,9 @@
struct ure_softc *sc;
struct mii_data *mii;
if_t ifp;
+ uint16_t bmsr;
int locked;
+ int old_link, new_link;
sc = device_get_softc(dev);
mii = GET_MII(sc);
@@ -455,6 +459,7 @@
(if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0)
goto done;
+ old_link = (sc->sc_flags & URE_FLAG_LINK) ? 1 : 0;
sc->sc_flags &= ~URE_FLAG_LINK;
if ((mii->mii_media_status & (IFM_ACTIVE | IFM_AVALID)) ==
(IFM_ACTIVE | IFM_AVALID)) {
@@ -475,6 +480,56 @@
}
}
+ new_link = (sc->sc_flags & URE_FLAG_LINK) ? 1 : 0;
+ if (old_link != new_link) {
+ if (!new_link) {
+ /*
+ * MII layer reports link down. Verify by
+ * reading the PHY BMSR register directly.
+ * BMSR link status is latched-low, so read
+ * twice: first clears any stale latch,
+ * second gives current state.
+ */
+ (void)ure_ocp_reg_read(sc,
+ URE_OCP_BASE_MII + MII_BMSR * 2);
+ bmsr = ure_ocp_reg_read(sc,
+ URE_OCP_BASE_MII + MII_BMSR * 2);
+
+ if (bmsr & BMSR_LINK) {
+ /*
+ * PHY still has link. This is a
+ * spurious link-down event from the
+ * MII polling race (see PR 252165).
+ * Override the status and kick TX.
+ * Also restore IFM_ACTIVE so the
+ * subsequent MIIBUS_LINKCHG check in
+ * mii_phy_update sees no status
+ * change and doesn't fire.
+ */
+ device_printf(dev,
+ "spurious link down (PHY "
+ "BMSR=0x%04x link up), "
+ "overriding\n", bmsr);
+ sc->sc_flags |= URE_FLAG_LINK;
+ mii->mii_media_status |= IFM_ACTIVE;
+ for (int i = 0; i < URE_MAX_TX; i++)
+ usbd_transfer_start(
+ sc->sc_tx_xfer[i]);
+ goto done;
+ }
+
+ /* PHY confirms link is genuinely down. */
+ goto done;
+ }
+
+ /*
+ * Link came up. Restart the TX transfers
+ * in case they went idle while link was down.
+ */
+ for (int i = 0; i < URE_MAX_TX; i++)
+ usbd_transfer_start(sc->sc_tx_xfer[i]);
+ }
+
/* Lost link, do nothing. */
if ((sc->sc_flags & URE_FLAG_LINK) == 0)
goto done;
@@ -483,6 +538,40 @@
URE_UNLOCK(sc);
}
+static void
+ure_miibus_linkchg(device_t dev)
+{
+ struct ure_softc *sc;
+ struct mii_data *mii;
+ uint16_t bmsr;
+ int locked;
+
+ sc = device_get_softc(dev);
+ mii = GET_MII(sc);
+ locked = mtx_owned(&sc->sc_mtx);
+ if (!locked)
+ URE_LOCK(sc);
+
+ /*
+ * This is called by the default miibus linkchg handler
+ * before it calls if_link_state_change(). If the PHY
+ * still has link but the MII layer lost IFM_ACTIVE due
+ * to the polling race (see PR 252165), restore it so the
+ * notification goes out as LINK_STATE_UP rather than DOWN.
+ */
+ if (mii != NULL && !(mii->mii_media_status & IFM_ACTIVE)) {
+ (void)ure_ocp_reg_read(sc,
+ URE_OCP_BASE_MII + MII_BMSR * 2);
+ bmsr = ure_ocp_reg_read(sc,
+ URE_OCP_BASE_MII + MII_BMSR * 2);
+ if (bmsr & BMSR_LINK)
+ mii->mii_media_status |= IFM_ACTIVE;
+ }
+
+ if (!locked)
+ URE_UNLOCK(sc);
+}
+
/*
* Probe for a RTL8152/RTL8153/RTL8156 chip.
*/

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