netdev - [PATCH net-next] ibmvnic: Return from ibmvnic_resume if not in VNIC

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Date:   Mon, 19 Jun 2017 11:27:53 -0500
From:   John Allen <jallen@...ux.vnet.ibm.com>
To:     netdev@...r.kernel.org
Cc:     Nathan Fontenot <nfont@...ux.vnet.ibm.com>,
        Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
Subject: [PATCH net-next] ibmvnic: Return from ibmvnic_resume if not in
 VNIC_OPEN state

If the ibmvnic driver is not in the VNIC_OPEN state, return from
ibmvnic_resume callback. If we are not in the VNIC_OPEN state, interrupts
may not be initialized and directly calling the interrupt handler will
cause a crash.

Signed-off-by: John Allen <jallen@...ux.vnet.ibm.com>
---
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 722daf5..0135095 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -3859,6 +3859,9 @@ static int ibmvnic_resume(struct device *dev)
 	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 	int i;

+	if (adapter->state != VNIC_OPEN)
+		return 0;
+
 	/* kick the interrupt handlers just in case we lost an interrupt */
 	for (i = 0; i < adapter->req_rx_queues; i++)
 		ibmvnic_interrupt_rx(adapter->rx_scrq[i]->irq,