1 files changed, 158 insertions, 235 deletions

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index f79034c786c8..1c0e4beb56e7 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -115,7 +115,7 @@ struct ibmvnic_stat {
 
 #define IBMVNIC_STAT_OFF(stat) (offsetof(struct ibmvnic_adapter, stats) + \
 			     offsetof(struct ibmvnic_statistics, stat))
-#define IBMVNIC_GET_STAT(a, off) (*((u64 *)(((unsigned long)(a)) + off)))
+#define IBMVNIC_GET_STAT(a, off) (*((u64 *)(((unsigned long)(a)) + (off))))
 
 static const struct ibmvnic_stat ibmvnic_stats[] = {
 	{"rx_packets", IBMVNIC_STAT_OFF(rx_packets)},
@@ -247,46 +247,23 @@ static void free_long_term_buff(struct ibmvnic_adapter *adapter,
 	if (!ltb->buff)
 		return;
 
+	/* VIOS automatically unmaps the long term buffer at remote
+	 * end for the following resets:
+	 * FAILOVER, MOBILITY, TIMEOUT.
+	 */
 	if (adapter->reset_reason != VNIC_RESET_FAILOVER &&
-	    adapter->reset_reason != VNIC_RESET_MOBILITY)
+	    adapter->reset_reason != VNIC_RESET_MOBILITY &&
+	    adapter->reset_reason != VNIC_RESET_TIMEOUT)
 		send_request_unmap(adapter, ltb->map_id);
 	dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
 }
 
-static int reset_long_term_buff(struct ibmvnic_adapter *adapter,
-				struct ibmvnic_long_term_buff *ltb)
+static int reset_long_term_buff(struct ibmvnic_long_term_buff *ltb)
 {
-	struct device *dev = &adapter->vdev->dev;
-	int rc;
+	if (!ltb->buff)
+		return -EINVAL;
 
 	memset(ltb->buff, 0, ltb->size);
-
-	mutex_lock(&adapter->fw_lock);
-	adapter->fw_done_rc = 0;
-
-	reinit_completion(&adapter->fw_done);
-	rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id);
-	if (rc) {
-		mutex_unlock(&adapter->fw_lock);
-		return rc;
-	}
-
-	rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
-	if (rc) {
-		dev_info(dev,
-			 "Reset failed, long term map request timed out or aborted\n");
-		mutex_unlock(&adapter->fw_lock);
-		return rc;
-	}
-
-	if (adapter->fw_done_rc) {
-		dev_info(dev,
-			 "Reset failed, attempting to free and reallocate buffer\n");
-		free_long_term_buff(adapter, ltb);
-		mutex_unlock(&adapter->fw_lock);
-		return alloc_long_term_buff(adapter, ltb, ltb->size);
-	}
-	mutex_unlock(&adapter->fw_lock);
 	return 0;
 }
 
@@ -508,8 +485,7 @@ static int reset_rx_pools(struct ibmvnic_adapter *adapter)
 						  rx_pool->size *
 						  rx_pool->buff_size);
 		} else {
-			rc = reset_long_term_buff(adapter,
-						  &rx_pool->long_term_buff);
+			rc = reset_long_term_buff(&rx_pool->long_term_buff);
 		}
 
 		if (rc)
@@ -632,12 +608,11 @@ static int init_rx_pools(struct net_device *netdev)
 	return 0;
 }
 
-static int reset_one_tx_pool(struct ibmvnic_adapter *adapter,
-			     struct ibmvnic_tx_pool *tx_pool)
+static int reset_one_tx_pool(struct ibmvnic_tx_pool *tx_pool)
 {
 	int rc, i;
 
-	rc = reset_long_term_buff(adapter, &tx_pool->long_term_buff);
+	rc = reset_long_term_buff(&tx_pool->long_term_buff);
 	if (rc)
 		return rc;
 
@@ -664,10 +639,10 @@ static int reset_tx_pools(struct ibmvnic_adapter *adapter)
 
 	tx_scrqs = adapter->num_active_tx_pools;
 	for (i = 0; i < tx_scrqs; i++) {
-		rc = reset_one_tx_pool(adapter, &adapter->tso_pool[i]);
+		rc = reset_one_tx_pool(&adapter->tso_pool[i]);
 		if (rc)
 			return rc;
-		rc = reset_one_tx_pool(adapter, &adapter->tx_pool[i]);
+		rc = reset_one_tx_pool(&adapter->tx_pool[i]);
 		if (rc)
 			return rc;
 	}
@@ -1221,8 +1196,7 @@ static int ibmvnic_open(struct net_device *netdev)
 	rc = __ibmvnic_open(netdev);
 
 out:
-	/*
-	 * If open fails due to a pending failover, set device state and
+	/* If open fails due to a pending failover, set device state and
 	 * return. Device operation will be handled by reset routine.
 	 */
 	if (rc && adapter->failover_pending) {
@@ -1353,10 +1327,8 @@ static int __ibmvnic_close(struct net_device *netdev)
 
 	adapter->state = VNIC_CLOSING;
 	rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
-	if (rc)
-		return rc;
 	adapter->state = VNIC_CLOSED;
-	return 0;
+	return rc;
 }
 
 static int ibmvnic_close(struct net_device *netdev)
@@ -1384,10 +1356,10 @@ static int ibmvnic_close(struct net_device *netdev)
 
 /**
  * build_hdr_data - creates L2/L3/L4 header data buffer
- * @hdr_field - bitfield determining needed headers
- * @skb - socket buffer
- * @hdr_len - array of header lengths
- * @tot_len - total length of data
+ * @hdr_field: bitfield determining needed headers
+ * @skb: socket buffer
+ * @hdr_len: array of header lengths
+ * @hdr_data: buffer to write the header to
  *
  * Reads hdr_field to determine which headers are needed by firmware.
  * Builds a buffer containing these headers.  Saves individual header
@@ -1444,11 +1416,11 @@ static int build_hdr_data(u8 hdr_field, struct sk_buff *skb,
 
 /**
  * create_hdr_descs - create header and header extension descriptors
- * @hdr_field - bitfield determining needed headers
- * @data - buffer containing header data
- * @len - length of data buffer
- * @hdr_len - array of individual header lengths
- * @scrq_arr - descriptor array
+ * @hdr_field: bitfield determining needed headers
+ * @hdr_data: buffer containing header data
+ * @len: length of data buffer
+ * @hdr_len: array of individual header lengths
+ * @scrq_arr: descriptor array
  *
  * Creates header and, if needed, header extension descriptors and
  * places them in a descriptor array, scrq_arr
@@ -1496,10 +1468,9 @@ static int create_hdr_descs(u8 hdr_field, u8 *hdr_data, int len, int *hdr_len,
 
 /**
  * build_hdr_descs_arr - build a header descriptor array
- * @skb - socket buffer
- * @num_entries - number of descriptors to be sent
- * @subcrq - first TX descriptor
- * @hdr_field - bit field determining which headers will be sent
+ * @txbuff: tx buffer
+ * @num_entries: number of descriptors to be sent
+ * @hdr_field: bit field determining which headers will be sent
  *
  * This function will build a TX descriptor array with applicable
  * L2/L3/L4 packet header descriptors to be sent by send_subcrq_indirect.
@@ -1702,6 +1673,9 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 		skb_copy_from_linear_data(skb, dst, skb->len);
 	}
 
+	/* post changes to long_term_buff *dst before VIOS accessing it */
+	dma_wmb();
+
 	tx_pool->consumer_index =
 	    (tx_pool->consumer_index + 1) % tx_pool->num_buffers;
 
@@ -1925,93 +1899,7 @@ static int ibmvnic_set_mac(struct net_device *netdev, void *p)
 	return rc;
 }
 
-/**
- * do_change_param_reset returns zero if we are able to keep processing reset
- * events, or non-zero if we hit a fatal error and must halt.
- */
-static int do_change_param_reset(struct ibmvnic_adapter *adapter,
-				 struct ibmvnic_rwi *rwi,
-				 u32 reset_state)
-{
-	struct net_device *netdev = adapter->netdev;
-	int i, rc;
-
-	netdev_dbg(adapter->netdev, "Change param resetting driver (%d)\n",
-		   rwi->reset_reason);
-
-	netif_carrier_off(netdev);
-	adapter->reset_reason = rwi->reset_reason;
-
-	ibmvnic_cleanup(netdev);
-
-	if (reset_state == VNIC_OPEN) {
-		rc = __ibmvnic_close(netdev);
-		if (rc)
-			goto out;
-	}
-
-	release_resources(adapter);
-	release_sub_crqs(adapter, 1);
-	release_crq_queue(adapter);
-
-	adapter->state = VNIC_PROBED;
-
-	rc = init_crq_queue(adapter);
-
-	if (rc) {
-		netdev_err(adapter->netdev,
-			   "Couldn't initialize crq. rc=%d\n", rc);
-		return rc;
-	}
-
-	rc = ibmvnic_reset_init(adapter, true);
-	if (rc) {
-		rc = IBMVNIC_INIT_FAILED;
-		goto out;
-	}
-
-	/* If the adapter was in PROBE state prior to the reset,
-	 * exit here.
-	 */
-	if (reset_state == VNIC_PROBED)
-		goto out;
-
-	rc = ibmvnic_login(netdev);
-	if (rc) {
-		goto out;
-	}
-
-	rc = init_resources(adapter);
-	if (rc)
-		goto out;
-
-	ibmvnic_disable_irqs(adapter);
-
-	adapter->state = VNIC_CLOSED;
-
-	if (reset_state == VNIC_CLOSED)
-		return 0;
-
-	rc = __ibmvnic_open(netdev);
-	if (rc) {
-		rc = IBMVNIC_OPEN_FAILED;
-		goto out;
-	}
-
-	/* refresh device's multicast list */
-	ibmvnic_set_multi(netdev);
-
-	/* kick napi */
-	for (i = 0; i < adapter->req_rx_queues; i++)
-		napi_schedule(&adapter->napi[i]);
-
-out:
-	if (rc)
-		adapter->state = reset_state;
-	return rc;
-}
-
-/**
+/*
  * do_reset returns zero if we are able to keep processing reset events, or
  * non-zero if we hit a fatal error and must halt.
  */
@@ -2028,9 +1916,12 @@ static int do_reset(struct ibmvnic_adapter *adapter,
 		   adapter->state, adapter->failover_pending,
 		   rwi->reset_reason, reset_state);
 
-	rtnl_lock();
-	/*
-	 * Now that we have the rtnl lock, clear any pending failover.
+	adapter->reset_reason = rwi->reset_reason;
+	/* requestor of VNIC_RESET_CHANGE_PARAM already has the rtnl lock */
+	if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
+		rtnl_lock();
+
+	/* Now that we have the rtnl lock, clear any pending failover.
 	 * This will ensure ibmvnic_open() has either completed or will
 	 * block until failover is complete.
 	 */
@@ -2038,7 +1929,6 @@ static int do_reset(struct ibmvnic_adapter *adapter,
 		adapter->failover_pending = false;
 
 	netif_carrier_off(netdev);
-	adapter->reset_reason = rwi->reset_reason;
 
 	old_num_rx_queues = adapter->req_rx_queues;
 	old_num_tx_queues = adapter->req_tx_queues;
@@ -2050,25 +1940,37 @@ static int do_reset(struct ibmvnic_adapter *adapter,
 	if (reset_state == VNIC_OPEN &&
 	    adapter->reset_reason != VNIC_RESET_MOBILITY &&
 	    adapter->reset_reason != VNIC_RESET_FAILOVER) {
-		adapter->state = VNIC_CLOSING;
+		if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
+			rc = __ibmvnic_close(netdev);
+			if (rc)
+				goto out;
+		} else {
+			adapter->state = VNIC_CLOSING;
 
-		/* Release the RTNL lock before link state change and
-		 * re-acquire after the link state change to allow
-		 * linkwatch_event to grab the RTNL lock and run during
-		 * a reset.
-		 */
-		rtnl_unlock();
-		rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
-		rtnl_lock();
-		if (rc)
-			goto out;
+			/* Release the RTNL lock before link state change and
+			 * re-acquire after the link state change to allow
+			 * linkwatch_event to grab the RTNL lock and run during
+			 * a reset.
+			 */
+			rtnl_unlock();
+			rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
+			rtnl_lock();
+			if (rc)
+				goto out;
 
-		if (adapter->state != VNIC_CLOSING) {
-			rc = -1;
-			goto out;
+			if (adapter->state != VNIC_CLOSING) {
+				rc = -1;
+				goto out;
+			}
+
+			adapter->state = VNIC_CLOSED;
 		}
+	}
 
-		adapter->state = VNIC_CLOSED;
+	if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
+		release_resources(adapter);
+		release_sub_crqs(adapter, 1);
+		release_crq_queue(adapter);
 	}
 
 	if (adapter->reset_reason != VNIC_RESET_NON_FATAL) {
@@ -2077,7 +1979,9 @@ static int do_reset(struct ibmvnic_adapter *adapter,
 		 */
 		adapter->state = VNIC_PROBED;
 
-		if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
+		if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
+			rc = init_crq_queue(adapter);
+		} else if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
 			rc = ibmvnic_reenable_crq_queue(adapter);
 			release_sub_crqs(adapter, 1);
 		} else {
@@ -2112,11 +2016,14 @@ static int do_reset(struct ibmvnic_adapter *adapter,
 		}
 
 		rc = ibmvnic_login(netdev);
-		if (rc) {
+		if (rc)
 			goto out;
-		}
 
-		if (adapter->req_rx_queues != old_num_rx_queues ||
+		if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
+			rc = init_resources(adapter);
+			if (rc)
+				goto out;
+		} else if (adapter->req_rx_queues != old_num_rx_queues ||
 		    adapter->req_tx_queues != old_num_tx_queues ||
 		    adapter->req_rx_add_entries_per_subcrq !=
 		    old_num_rx_slots ||
@@ -2138,14 +2045,14 @@ static int do_reset(struct ibmvnic_adapter *adapter,
 			rc = reset_tx_pools(adapter);
 			if (rc) {
 				netdev_dbg(adapter->netdev, "reset tx pools failed (%d)\n",
-						rc);
+					   rc);
 				goto out;
 			}
 
 			rc = reset_rx_pools(adapter);
 			if (rc) {
 				netdev_dbg(adapter->netdev, "reset rx pools failed (%d)\n",
-						rc);
+					   rc);
 				goto out;
 			}
 		}
@@ -2181,7 +2088,9 @@ out:
 	/* restore the adapter state if reset failed */
 	if (rc)
 		adapter->state = reset_state;
-	rtnl_unlock();
+	/* requestor of VNIC_RESET_CHANGE_PARAM should still hold the rtnl lock */
+	if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
+		rtnl_unlock();
 
 	netdev_dbg(adapter->netdev, "[S:%d FOP:%d] Reset done, rc %d\n",
 		   adapter->state, adapter->failover_pending, rc);
@@ -2312,12 +2221,8 @@ static void __ibmvnic_reset(struct work_struct *work)
 		}
 		spin_unlock_irqrestore(&adapter->state_lock, flags);
 
-		if (rwi->reset_reason == VNIC_RESET_CHANGE_PARAM) {
-			/* CHANGE_PARAM requestor holds rtnl_lock */
-			rc = do_change_param_reset(adapter, rwi, reset_state);
-		} else if (adapter->force_reset_recovery) {
-			/*
-			 * Since we are doing a hard reset now, clear the
+		if (adapter->force_reset_recovery) {
+			/* Since we are doing a hard reset now, clear the
 			 * failover_pending flag so we don't ignore any
 			 * future MOBILITY or other resets.
 			 */
@@ -2389,8 +2294,9 @@ static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
 	unsigned long flags;
 	int ret;
 
-	/*
-	 * If failover is pending don't schedule any other reset.
+	spin_lock_irqsave(&adapter->rwi_lock, flags);
+
+	/* If failover is pending don't schedule any other reset.
 	 * Instead let the failover complete. If there is already a
 	 * a failover reset scheduled, we will detect and drop the
 	 * duplicate reset when walking the ->rwi_list below.
@@ -2405,18 +2311,16 @@ static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
 
 	if (adapter->state == VNIC_PROBING) {
 		netdev_warn(netdev, "Adapter reset during probe\n");
-		ret = adapter->init_done_rc = EAGAIN;
+		adapter->init_done_rc = EAGAIN;
+		ret = EAGAIN;
 		goto err;
 	}
 
-	spin_lock_irqsave(&adapter->rwi_lock, flags);
-
 	list_for_each(entry, &adapter->rwi_list) {
 		tmp = list_entry(entry, struct ibmvnic_rwi, list);
 		if (tmp->reset_reason == reason) {
 			netdev_dbg(netdev, "Skipping matching reset, reason=%d\n",
 				   reason);
-			spin_unlock_irqrestore(&adapter->rwi_lock, flags);
 			ret = EBUSY;
 			goto err;
 		}
@@ -2424,8 +2328,6 @@ static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
 
 	rwi = kzalloc(sizeof(*rwi), GFP_ATOMIC);
 	if (!rwi) {
-		spin_unlock_irqrestore(&adapter->rwi_lock, flags);
-		ibmvnic_close(netdev);
 		ret = ENOMEM;
 		goto err;
 	}
@@ -2438,12 +2340,17 @@ static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
 	}
 	rwi->reset_reason = reason;
 	list_add_tail(&rwi->list, &adapter->rwi_list);
-	spin_unlock_irqrestore(&adapter->rwi_lock, flags);
 	netdev_dbg(adapter->netdev, "Scheduling reset (reason %d)\n", reason);
 	schedule_work(&adapter->ibmvnic_reset);
 
-	return 0;
+	ret = 0;
 err:
+	/* ibmvnic_close() below can block, so drop the lock first */
+	spin_unlock_irqrestore(&adapter->rwi_lock, flags);
+
+	if (ret == ENOMEM)
+		ibmvnic_close(netdev);
+
 	return -ret;
 }
 
@@ -2511,16 +2418,9 @@ restart_poll:
 
 		if (!pending_scrq(adapter, rx_scrq))
 			break;
-		/* The queue entry at the current index is peeked at above
-		 * to determine that there is a valid descriptor awaiting
-		 * processing. We want to be sure that the current slot
-		 * holds a valid descriptor before reading its contents.
-		 */
-		dma_rmb();
 		next = ibmvnic_next_scrq(adapter, rx_scrq);
-		rx_buff =
-		    (struct ibmvnic_rx_buff *)be64_to_cpu(next->
-							  rx_comp.correlator);
+		rx_buff = (struct ibmvnic_rx_buff *)
+			  be64_to_cpu(next->rx_comp.correlator);
 		/* do error checking */
 		if (next->rx_comp.rc) {
 			netdev_dbg(netdev, "rx buffer returned with rc %x\n",
@@ -2541,6 +2441,8 @@ restart_poll:
 		offset = be16_to_cpu(next->rx_comp.off_frame_data);
 		flags = next->rx_comp.flags;
 		skb = rx_buff->skb;
+		/* load long_term_buff before copying to skb */
+		dma_rmb();
 		skb_copy_to_linear_data(skb, rx_buff->data + offset,
 					length);
 
@@ -2583,7 +2485,6 @@ restart_poll:
 		if (napi_complete_done(napi, frames_processed)) {
 			enable_scrq_irq(adapter, rx_scrq);
 			if (pending_scrq(adapter, rx_scrq)) {
-				rmb();
 				if (napi_reschedule(napi)) {
 					disable_scrq_irq(adapter, rx_scrq);
 					goto restart_poll;
@@ -2712,9 +2613,9 @@ static void ibmvnic_get_drvinfo(struct net_device *netdev,
 {
 	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
-	strlcpy(info->driver, ibmvnic_driver_name, sizeof(info->driver));
-	strlcpy(info->version, IBMVNIC_DRIVER_VERSION, sizeof(info->version));
-	strlcpy(info->fw_version, adapter->fw_version,
+	strscpy(info->driver, ibmvnic_driver_name, sizeof(info->driver));
+	strscpy(info->version, IBMVNIC_DRIVER_VERSION, sizeof(info->version));
+	strscpy(info->fw_version, adapter->fw_version,
 		sizeof(info->fw_version));
 }
 
@@ -2826,7 +2727,6 @@ static int ibmvnic_set_channels(struct net_device *netdev,
 			    channels->rx_count, channels->tx_count,
 			    adapter->req_rx_queues, adapter->req_tx_queues);
 	return ret;
-
 }
 
 static void ibmvnic_get_strings(struct net_device *dev, u32 stringset, u8 *data)
@@ -2915,8 +2815,8 @@ static void ibmvnic_get_ethtool_stats(struct net_device *dev,
 		return;
 
 	for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++)
-		data[i] = be64_to_cpu(IBMVNIC_GET_STAT(adapter,
-						ibmvnic_stats[i].offset));
+		data[i] = be64_to_cpu(IBMVNIC_GET_STAT
+				      (adapter, ibmvnic_stats[i].offset));
 
 	for (j = 0; j < adapter->req_tx_queues; j++) {
 		data[i] = adapter->tx_stats_buffers[j].packets;
@@ -2956,6 +2856,7 @@ static int ibmvnic_set_priv_flags(struct net_device *netdev, u32 flags)
 
 	return 0;
 }
+
 static const struct ethtool_ops ibmvnic_ethtool_ops = {
 	.get_drvinfo		= ibmvnic_get_drvinfo,
 	.get_msglevel		= ibmvnic_get_msglevel,
@@ -3225,7 +3126,7 @@ static int enable_scrq_irq(struct ibmvnic_adapter *adapter,
 		/* H_EOI would fail with rc = H_FUNCTION when running
 		 * in XIVE mode which is expected, but not an error.
 		 */
-		if (rc && (rc != H_FUNCTION))
+		if (rc && rc != H_FUNCTION)
 			dev_err(dev, "H_EOI FAILED irq 0x%llx. rc=%ld\n",
 				val, rc);
 	}
@@ -3256,13 +3157,6 @@ restart_loop:
 		int total_bytes = 0;
 		int num_packets = 0;
 
-		/* The queue entry at the current index is peeked at above
-		 * to determine that there is a valid descriptor awaiting
-		 * processing. We want to be sure that the current slot
-		 * holds a valid descriptor before reading its contents.
-		 */
-		dma_rmb();
-
 		next = ibmvnic_next_scrq(adapter, scrq);
 		for (i = 0; i < next->tx_comp.num_comps; i++) {
 			if (next->tx_comp.rcs[i])
@@ -3636,11 +3530,16 @@ static int pending_scrq(struct ibmvnic_adapter *adapter,
 			struct ibmvnic_sub_crq_queue *scrq)
 {
 	union sub_crq *entry = &scrq->msgs[scrq->cur];
+	int rc;
 
-	if (entry->generic.first & IBMVNIC_CRQ_CMD_RSP)
-		return 1;
-	else
-		return 0;
+	rc = !!(entry->generic.first & IBMVNIC_CRQ_CMD_RSP);
+
+	/* Ensure that the SCRQ valid flag is loaded prior to loading the
+	 * contents of the SCRQ descriptor
+	 */
+	dma_rmb();
+
+	return rc;
 }
 
 static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *adapter,
@@ -3659,8 +3558,8 @@ static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *adapter,
 	}
 	spin_unlock_irqrestore(&scrq->lock, flags);
 
-	/* Ensure that the entire buffer descriptor has been
-	 * loaded before reading its contents
+	/* Ensure that the SCRQ valid flag is loaded prior to loading the
+	 * contents of the SCRQ descriptor
 	 */
 	dma_rmb();
 
@@ -3710,7 +3609,7 @@ static int send_subcrq_indirect(struct ibmvnic_adapter *adapter,
 	int rc;
 
 	/* Make sure the hypervisor sees the complete request */
-	mb();
+	dma_wmb();
 	rc = plpar_hcall_norets(H_SEND_SUB_CRQ_INDIRECT, ua,
 				cpu_to_be64(remote_handle),
 				ioba, num_entries);
@@ -3730,8 +3629,8 @@ static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter,
 	int rc;
 
 	netdev_dbg(adapter->netdev, "Sending CRQ: %016lx %016lx\n",
-		   (unsigned long int)cpu_to_be64(u64_crq[0]),
-		   (unsigned long int)cpu_to_be64(u64_crq[1]));
+		   (unsigned long)cpu_to_be64(u64_crq[0]),
+		   (unsigned long)cpu_to_be64(u64_crq[1]));
 
 	if (!adapter->crq.active &&
 	    crq->generic.first != IBMVNIC_CRQ_INIT_CMD) {
@@ -3740,7 +3639,7 @@ static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter,
 	}
 
 	/* Make sure the hypervisor sees the complete request */
-	mb();
+	dma_wmb();
 
 	rc = plpar_hcall_norets(H_SEND_CRQ, ua,
 				cpu_to_be64(u64_crq[0]),
@@ -3936,15 +3835,15 @@ static int send_login(struct ibmvnic_adapter *adapter)
 
 	for (i = 0; i < adapter->req_tx_queues; i++) {
 		if (adapter->tx_scrq[i]) {
-			tx_list_p[i] = cpu_to_be64(adapter->tx_scrq[i]->
-						   crq_num);
+			tx_list_p[i] =
+				cpu_to_be64(adapter->tx_scrq[i]->crq_num);
 		}
 	}
 
 	for (i = 0; i < adapter->req_rx_queues; i++) {
 		if (adapter->rx_scrq[i]) {
-			rx_list_p[i] = cpu_to_be64(adapter->rx_scrq[i]->
-						   crq_num);
+			rx_list_p[i] =
+				cpu_to_be64(adapter->rx_scrq[i]->crq_num);
 		}
 	}
 
@@ -3960,7 +3859,7 @@ static int send_login(struct ibmvnic_adapter *adapter)
 	netdev_dbg(adapter->netdev, "Login Buffer:\n");
 	for (i = 0; i < (adapter->login_buf_sz - 1) / 8 + 1; i++) {
 		netdev_dbg(adapter->netdev, "%016lx\n",
-			   ((unsigned long int *)(adapter->login_buf))[i]);
+			   ((unsigned long *)(adapter->login_buf))[i]);
 	}
 
 	memset(&crq, 0, sizeof(crq));
@@ -4328,7 +4227,7 @@ static void handle_query_ip_offload_rsp(struct ibmvnic_adapter *adapter)
 	netdev_dbg(adapter->netdev, "Query IP Offload Buffer:\n");
 	for (i = 0; i < (sizeof(adapter->ip_offload_buf) - 1) / 8 + 1; i++)
 		netdev_dbg(adapter->netdev, "%016lx\n",
-			   ((unsigned long int *)(buf))[i]);
+			   ((unsigned long *)(buf))[i]);
 
 	netdev_dbg(adapter->netdev, "ipv4_chksum = %d\n", buf->ipv4_chksum);
 	netdev_dbg(adapter->netdev, "ipv6_chksum = %d\n", buf->ipv6_chksum);
@@ -4487,8 +4386,8 @@ static void handle_request_cap_rsp(union ibmvnic_crq *crq,
 	case PARTIALSUCCESS:
 		dev_info(dev, "req=%lld, rsp=%ld in %s queue, retrying.\n",
 			 *req_value,
-			 (long int)be64_to_cpu(crq->request_capability_rsp.
-					       number), name);
+			 (long)be64_to_cpu(crq->request_capability_rsp.number),
+			 name);
 
 		if (be16_to_cpu(crq->request_capability_rsp.capability) ==
 		    REQ_MTU) {
@@ -4558,7 +4457,7 @@ static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
 	netdev_dbg(adapter->netdev, "Login Response Buffer:\n");
 	for (i = 0; i < (adapter->login_rsp_buf_sz - 1) / 8 + 1; i++) {
 		netdev_dbg(adapter->netdev, "%016lx\n",
-			   ((unsigned long int *)(adapter->login_rsp_buf))[i]);
+			   ((unsigned long *)(adapter->login_rsp_buf))[i]);
 	}
 
 	/* Sanity checks */
@@ -4901,8 +4800,8 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
 	long rc;
 
 	netdev_dbg(netdev, "Handling CRQ: %016lx %016lx\n",
-		   (unsigned long int)cpu_to_be64(u64_crq[0]),
-		   (unsigned long int)cpu_to_be64(u64_crq[1]));
+		   (unsigned long)cpu_to_be64(u64_crq[0]),
+		   (unsigned long)cpu_to_be64(u64_crq[1]));
 	switch (gen_crq->first) {
 	case IBMVNIC_CRQ_INIT_RSP:
 		switch (gen_crq->cmd) {
@@ -4918,7 +4817,22 @@ 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");
@@ -5361,8 +5275,6 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
 	netdev->ethtool_ops = &ibmvnic_ethtool_ops;
 	SET_NETDEV_DEV(netdev, &dev->dev);
 
-	spin_lock_init(&adapter->stats_lock);
-
 	INIT_WORK(&adapter->ibmvnic_reset, __ibmvnic_reset);
 	INIT_DELAYED_WORK(&adapter->ibmvnic_delayed_reset,
 			  __ibmvnic_delayed_reset);
@@ -5444,7 +5356,18 @@ static int ibmvnic_remove(struct vio_dev *dev)
 	unsigned long flags;
 
 	spin_lock_irqsave(&adapter->state_lock, flags);
+
+	/* If ibmvnic_reset() is scheduling a reset, wait for it to
+	 * finish. Then, set the state to REMOVING to prevent it from
+	 * scheduling any more work and to have reset functions ignore
+	 * any resets that have already been scheduled. Drop the lock
+	 * after setting state, so __ibmvnic_reset() which is called
+	 * from the flush_work() below, can make progress.
+	 */
+	spin_lock_irqsave(&adapter->rwi_lock, flags);
 	adapter->state = VNIC_REMOVING;
+	spin_unlock_irqrestore(&adapter->rwi_lock, flags);
+
 	spin_unlock_irqrestore(&adapter->state_lock, flags);
 
 	flush_work(&adapter->ibmvnic_reset);