net: thunderx: Fix for crash while BGX teardown

Cortina phy does not have kernel driver and we don't attach
device with phy layer for intefaces like XFI, XLAUI etc,
Hence check for interface type before calling disconnect.

Signed-off-by: Thanneeru Srinivasulu <[email protected]>
Signed-off-by: Aleksey Makarov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Thanneeru Srinivasulu

drivers/net/ethernet/cavium/thunder/thunder_bgx.c

@@ -673,7 +673,10 @@ static void bgx_lmac_disable(struct bgx *bgx, u8 lmacid)
 	bgx_reg_write(bgx, lmacid, BGX_CMRX_CFG, cmrx_cfg);
 	bgx_flush_dmac_addrs(bgx, lmacid);
 
-	if (lmac->phydev)
+	if ((bgx->lmac_type != BGX_MODE_XFI) &&
+	    (bgx->lmac_type != BGX_MODE_XLAUI) &&
+	    (bgx->lmac_type != BGX_MODE_40G_KR) &&
+	    (bgx->lmac_type != BGX_MODE_10G_KR) && lmac->phydev)
 		phy_disconnect(lmac->phydev);
 
 	lmac->phydev = NULL;