[PATCH 5.4 36/60] ibmvnic: Clear failover_pending if unable to schedule

[Greg Kroah-Hartman]

From: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxx>

[ Upstream commit ef66a1eace968ff22a35f45e6e8ec36b668b6116 ]

Normally we clear the failover_pending flag when processing the reset.
But if we are unable to schedule a failover reset we must clear the
flag ourselves. We could fail to schedule the reset if we are in PROBING
state (eg: when booting via kexec) or because we could not allocate memory.

Thanks to Cris Forno for helping isolate the problem and for testing.

Fixes: 1d8504937478 ("powerpc/vnic: Extend "failover pending" window")
Signed-off-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxx>
Tested-by: Cristobal Forno <cforno12@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210203050802.680772-1-sukadev@xxxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index c3079f436f6d7..0f35eec967ae8 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -4595,7 +4595,22 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
 				complete(&adapter->init_done);
 				adapter->init_done_rc = -EIO;
 			}
-			ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
+			rc = ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
+			if (rc && rc != -EBUSY) {
+				/* We were unable to schedule the failover
+				 * reset either because the adapter was still
+				 * probing (eg: during kexec) or we could not
+				 * allocate memory. Clear the failover_pending
+				 * flag since no one else will. We ignore
+				 * EBUSY because it means either FAILOVER reset
+				 * is already scheduled or the adapter is
+				 * being removed.
+				 */
+				netdev_err(netdev,
+					   "Error %ld scheduling failover reset\n",
+					   rc);
+				adapter->failover_pending = false;
+			}
 			break;
 		case IBMVNIC_CRQ_INIT_COMPLETE:
 			dev_info(dev, "Partner initialization complete\n");
-- 
2.27.0