From 6a2fb0e99f9cab349dce0a36862b0cd370036452 Mon Sep 17 00:00:00 2001 From: Nathan Fontenot Date: Thu, 15 Jun 2017 14:48:09 -0400 Subject: [PATCH] ibmvnic: driver initialization for kdump/kexec When booting into the kdump/kexec kernel, pHyp and vios are not prepared for the initialization crq request and a failover transport event is generated. This is not handled correctly. At this point in initialization the driver is still in the 'probing' state and cannot handle a full reset of the driver as is normally done for a failover transport event. To correct this we catch driver resets while still in the 'probing' state and return EAGAIN. This results in the driver tearing down the main crq and calling ibmvnic_init() again. Signed-off-by: Nathan Fontenot Signed-off-by: David S. Miller --- drivers/net/ethernet/ibm/ibmvnic.c | 24 +++++++++++++++++++----- 1 file changed, 19 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 9923b9fa0c74..722daf55d757 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -1454,6 +1454,12 @@ static void ibmvnic_reset(struct ibmvnic_adapter *adapter, return; } + if (adapter->state == VNIC_PROBING) { + netdev_warn(netdev, "Adapter reset during probe\n"); + adapter->init_done_rc = EAGAIN; + return; + } + mutex_lock(&adapter->rwi_lock); list_for_each(entry, &adapter->rwi_list) { @@ -3649,12 +3655,18 @@ static int ibmvnic_init(struct ibmvnic_adapter *adapter) adapter->from_passive_init = false; init_completion(&adapter->init_done); + adapter->init_done_rc = 0; ibmvnic_send_crq_init(adapter); if (!wait_for_completion_timeout(&adapter->init_done, timeout)) { dev_err(dev, "Initialization sequence timed out\n"); return -1; } + if (adapter->init_done_rc) { + release_crq_queue(adapter); + return adapter->init_done_rc; + } + if (adapter->from_passive_init) { adapter->state = VNIC_OPEN; adapter->from_passive_init = false; @@ -3723,11 +3735,13 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id) mutex_init(&adapter->rwi_lock); adapter->resetting = false; - rc = ibmvnic_init(adapter); - if (rc) { - free_netdev(netdev); - return rc; - } + do { + rc = ibmvnic_init(adapter); + if (rc != EAGAIN) { + free_netdev(netdev); + return rc; + } + } while (rc == EAGAIN); netdev->mtu = adapter->req_mtu - ETH_HLEN; -- 2.20.1