net/tg3: Release IRQs on permanent error

When having permanent EEH error, the PCI device will be removed
from the system. For this case, we shouldn't set pcierr_recovery
to true wrongly, which blocks the driver to release the allocated
interrupts and their handlers. Eventually, we can't disable MSI
or MSIx successfully because of the MSI or MSIx interrupts still
have associated interrupt actions, which is turned into following
stack dump.

Oops: Exception in kernel mode, sig: 5 [hardkernel#1]
        :
[c0000000003b76a8] .free_msi_irqs+0x80/0x1a0 (unreliable)
[c00000000039f388] .pci_remove_bus_device+0x98/0x110
[c0000000000790f4] .pcibios_remove_pci_devices+0x9c/0x128
[c000000000077b98] .handle_eeh_events+0x2d8/0x4b0
[c0000000000782d0] .eeh_event_handler+0x130/0x1c0
[c000000000022bd4] .kernel_thread+0x54/0x70

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Prashant Sreedharan <prashant@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/tg3.c

@@ -18129,7 +18129,9 @@ static pci_ers_result_t tg3_io_error_detected(struct pci_dev *pdev,
 
 	rtnl_lock();
 
-	tp->pcierr_recovery = true;
+	/* We needn't recover from permanent error */
+	if (state == pci_channel_io_frozen)
+		tp->pcierr_recovery = true;
 
 	/* We probably don't have netdev yet */
 	if (!netdev || !netif_running(netdev))