sfc: Change falcon_probe_board() to fail for unsupported boards

The driver needs specific PHY and board support code for each SFC4000
board; there is no point trying to continue if it is missing.
Currently unsupported boards can trigger an 'oops'.
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
Cc: stable@kernel.org
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/sfc/falcon.c

@@ -1320,7 +1320,9 @@ static int falcon_probe_nvconfig(struct efx_nic *efx)
 
 	EFX_LOG(efx, "PHY is %d phy_id %d\n", efx->phy_type, efx->mdio.prtad);
 
-	falcon_probe_board(efx, board_rev);
+	rc = falcon_probe_board(efx, board_rev);
+	if (rc)
+		goto fail2;
 
 	kfree(nvconfig);
 	return 0;

drivers/net/sfc/falcon_boards.c

@@ -728,15 +728,7 @@ static const struct falcon_board_type board_types[] = {
 	},
 };
 
-static const struct falcon_board_type falcon_dummy_board = {
-	.init		= efx_port_dummy_op_int,
-	.init_phy	= efx_port_dummy_op_void,
-	.fini		= efx_port_dummy_op_void,
-	.set_id_led	= efx_port_dummy_op_set_id_led,
-	.monitor	= efx_port_dummy_op_int,
-};
-
-void falcon_probe_board(struct efx_nic *efx, u16 revision_info)
+int falcon_probe_board(struct efx_nic *efx, u16 revision_info)
 {
 	struct falcon_board *board = falcon_board(efx);
 	u8 type_id = FALCON_BOARD_TYPE(revision_info);
@@ -754,8 +746,9 @@ void falcon_probe_board(struct efx_nic *efx, u16 revision_info)
 			 (efx->pci_dev->subsystem_vendor == EFX_VENDID_SFC)
 			 ? board->type->ref_model : board->type->gen_type,
 			 'A' + board->major, board->minor);
+		return 0;
 	} else {
 		EFX_ERR(efx, "unknown board type %d\n", type_id);
-		board->type = &falcon_dummy_board;
+		return -ENODEV;
 	}
 }

drivers/net/sfc/nic.h

@@ -156,7 +156,7 @@ extern struct efx_nic_type siena_a0_nic_type;
  **************************************************************************
  */
 
-extern void falcon_probe_board(struct efx_nic *efx, u16 revision_info);
+extern int falcon_probe_board(struct efx_nic *efx, u16 revision_info);
 
 /* TX data path */
 extern int efx_nic_probe_tx(struct efx_tx_queue *tx_queue);