[PATCH] tg3: clean up PHYLIB resources on probe failure

tg3_get_invariants() can register an MDIO bus and connect a PHY for
USE_PHYLIB devices. If tg3_init_one() later fails, its common error path
releases the mappings and netdev without undoing those PHYLIB resources.

Disconnect the PHY and unregister the MDIO bus before the remaining
teardown. The existing IS_CONNECTED and MDIOBUS_INITED flags make both
helpers safe when initialization only completed partially.

This issue was identified during our ongoing static-analysis research while
reviewing kernel code.

Fixes: 158d7abdae85 ("tg3: Add mdio bus registration")
Assisted-by: OpenAI:GPT-5.6
Co-developed-by: Ijae Kim <redacted>
Signed-off-by: Ijae Kim <redacted>
Signed-off-by: Myeonghun Pak <redacted>
---
 drivers/net/ethernet/broadcom/tg3.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 73a4b569b..4662e0e92 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c

@@ -18047,6 +18047,11 @@ static int tg3_init_one(struct pci_dev *pdev,
 	return 0;
 
 err_out_apeunmap:
+	if (tg3_flag(tp, USE_PHYLIB)) {
+		tg3_phy_fini(tp);
+		tg3_mdio_fini(tp);
+	}
+
 	if (tp->aperegs) {
 		iounmap(tp->aperegs);
 		tp->aperegs = NULL;

-- 
2.47.1