[PATCH net-next 06/10] ibmvnic: Remove inflight list

[Nathan Fontenot <nfont@linux.vnet.ibm.com>]

The inflight list used to track memory that is allocated for crq that are
inflight is not needed. The one piece of the inflight list that does need
to be cleaned at module exit is the error buffer list which is already
attached to the adapter struct.

This patch removes the inflight list and moves checking the error buffer
list to ibmvnic_remove.

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c |   98 +++++++-----------------------------
 drivers/net/ethernet/ibm/ibmvnic.h |    9 ---
 2 files changed, 19 insertions(+), 88 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 27d7d27..18673e2 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -546,6 +546,23 @@ static int init_bounce_buffer(struct net_device *netdev)
 	return 0;
 }
 
+static void release_error_buffers(struct ibmvnic_adapter *adapter)
+{
+	struct device *dev = &adapter->vdev->dev;
+	struct ibmvnic_error_buff *error_buff, *tmp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&adapter->error_list_lock, flags);
+	list_for_each_entry_safe(error_buff, tmp, &adapter->errors, list) {
+		list_del(&error_buff->list);
+		dma_unmap_single(dev, error_buff->dma, error_buff->len,
+				 DMA_FROM_DEVICE);
+		kfree(error_buff->buff);
+		kfree(error_buff);
+	}
+	spin_unlock_irqrestore(&adapter->error_list_lock, flags);
+}
+
 static int ibmvnic_login(struct net_device *netdev)
 {
 	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
@@ -588,6 +605,7 @@ static void release_resources(struct ibmvnic_adapter *adapter)
 	release_crq_queue(adapter);
 
 	release_stats_token(adapter);
+	release_error_buffers(adapter);
 }
 
 static int ibmvnic_open(struct net_device *netdev)
@@ -1957,13 +1975,11 @@ static void send_login(struct ibmvnic_adapter *adapter)
 {
 	struct ibmvnic_login_rsp_buffer *login_rsp_buffer;
 	struct ibmvnic_login_buffer *login_buffer;
-	struct ibmvnic_inflight_cmd *inflight_cmd;
 	struct device *dev = &adapter->vdev->dev;
 	dma_addr_t rsp_buffer_token;
 	dma_addr_t buffer_token;
 	size_t rsp_buffer_size;
 	union ibmvnic_crq crq;
-	unsigned long flags;
 	size_t buffer_size;
 	__be64 *tx_list_p;
 	__be64 *rx_list_p;
@@ -2000,11 +2016,7 @@ static void send_login(struct ibmvnic_adapter *adapter)
 		dev_err(dev, "Couldn't map login rsp buffer\n");
 		goto buf_rsp_map_failed;
 	}
-	inflight_cmd = kmalloc(sizeof(*inflight_cmd), GFP_ATOMIC);
-	if (!inflight_cmd) {
-		dev_err(dev, "Couldn't allocate inflight_cmd\n");
-		goto inflight_alloc_failed;
-	}
+
 	adapter->login_buf = login_buffer;
 	adapter->login_buf_token = buffer_token;
 	adapter->login_buf_sz = buffer_size;
@@ -2055,20 +2067,10 @@ static void send_login(struct ibmvnic_adapter *adapter)
 	crq.login.cmd = LOGIN;
 	crq.login.ioba = cpu_to_be32(buffer_token);
 	crq.login.len = cpu_to_be32(buffer_size);
-
-	memcpy(&inflight_cmd->crq, &crq, sizeof(crq));
-
-	spin_lock_irqsave(&adapter->inflight_lock, flags);
-	list_add_tail(&inflight_cmd->list, &adapter->inflight);
-	spin_unlock_irqrestore(&adapter->inflight_lock, flags);
-
 	ibmvnic_send_crq(adapter, &crq);
 
 	return;
 
-inflight_alloc_failed:
-	dma_unmap_single(dev, rsp_buffer_token, rsp_buffer_size,
-			 DMA_FROM_DEVICE);
 buf_rsp_map_failed:
 	kfree(login_rsp_buffer);
 buf_rsp_alloc_failed:
@@ -2374,7 +2376,6 @@ static void handle_error_indication(union ibmvnic_crq *crq,
 				    struct ibmvnic_adapter *adapter)
 {
 	int detail_len = be32_to_cpu(crq->error_indication.detail_error_sz);
-	struct ibmvnic_inflight_cmd *inflight_cmd;
 	struct device *dev = &adapter->vdev->dev;
 	struct ibmvnic_error_buff *error_buff;
 	union ibmvnic_crq new_crq;
@@ -2406,15 +2407,6 @@ static void handle_error_indication(union ibmvnic_crq *crq,
 		return;
 	}
 
-	inflight_cmd = kmalloc(sizeof(*inflight_cmd), GFP_ATOMIC);
-	if (!inflight_cmd) {
-		dma_unmap_single(dev, error_buff->dma, detail_len,
-				 DMA_FROM_DEVICE);
-		kfree(error_buff->buff);
-		kfree(error_buff);
-		return;
-	}
-
 	error_buff->len = detail_len;
 	error_buff->error_id = crq->error_indication.error_id;
 
@@ -2428,13 +2420,6 @@ static void handle_error_indication(union ibmvnic_crq *crq,
 	new_crq.request_error_info.ioba = cpu_to_be32(error_buff->dma);
 	new_crq.request_error_info.len = cpu_to_be32(detail_len);
 	new_crq.request_error_info.error_id = crq->error_indication.error_id;
-
-	memcpy(&inflight_cmd->crq, &crq, sizeof(crq));
-
-	spin_lock_irqsave(&adapter->inflight_lock, flags);
-	list_add_tail(&inflight_cmd->list, &adapter->inflight);
-	spin_unlock_irqrestore(&adapter->inflight_lock, flags);
-
 	ibmvnic_send_crq(adapter, &new_crq);
 }
 
@@ -2819,48 +2804,6 @@ static void handle_query_cap_rsp(union ibmvnic_crq *crq,
 	}
 }
 
-static void ibmvnic_free_inflight(struct ibmvnic_adapter *adapter)
-{
-	struct ibmvnic_inflight_cmd *inflight_cmd, *tmp1;
-	struct device *dev = &adapter->vdev->dev;
-	struct ibmvnic_error_buff *error_buff, *tmp2;
-	unsigned long flags;
-	unsigned long flags2;
-
-	spin_lock_irqsave(&adapter->inflight_lock, flags);
-	list_for_each_entry_safe(inflight_cmd, tmp1, &adapter->inflight, list) {
-		switch (inflight_cmd->crq.generic.cmd) {
-		case LOGIN:
-			dma_unmap_single(dev, adapter->login_buf_token,
-					 adapter->login_buf_sz,
-					 DMA_BIDIRECTIONAL);
-			dma_unmap_single(dev, adapter->login_rsp_buf_token,
-					 adapter->login_rsp_buf_sz,
-					 DMA_BIDIRECTIONAL);
-			kfree(adapter->login_rsp_buf);
-			kfree(adapter->login_buf);
-			break;
-		case REQUEST_ERROR_INFO:
-			spin_lock_irqsave(&adapter->error_list_lock, flags2);
-			list_for_each_entry_safe(error_buff, tmp2,
-						 &adapter->errors, list) {
-				dma_unmap_single(dev, error_buff->dma,
-						 error_buff->len,
-						 DMA_FROM_DEVICE);
-				kfree(error_buff->buff);
-				list_del(&error_buff->list);
-				kfree(error_buff);
-			}
-			spin_unlock_irqrestore(&adapter->error_list_lock,
-					       flags2);
-			break;
-		}
-		list_del(&inflight_cmd->list);
-		kfree(inflight_cmd);
-	}
-	spin_unlock_irqrestore(&adapter->inflight_lock, flags);
-}
-
 static void ibmvnic_xport_event(struct work_struct *work)
 {
 	struct ibmvnic_adapter *adapter = container_of(work,
@@ -2869,7 +2812,6 @@ static void ibmvnic_xport_event(struct work_struct *work)
 	struct device *dev = &adapter->vdev->dev;
 	long rc;
 
-	ibmvnic_free_inflight(adapter);
 	release_sub_crqs(adapter);
 	if (adapter->migrated) {
 		rc = ibmvnic_reenable_crq_queue(adapter);
@@ -3333,9 +3275,7 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
 	spin_lock_init(&adapter->stats_lock);
 
 	INIT_LIST_HEAD(&adapter->errors);
-	INIT_LIST_HEAD(&adapter->inflight);
 	spin_lock_init(&adapter->error_list_lock);
-	spin_lock_init(&adapter->inflight_lock);
 
 	rc = ibmvnic_init(adapter);
 	if (rc) {
diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h
index 1b404ca..8fbe05d 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.h
+++ b/drivers/net/ethernet/ibm/ibmvnic.h
@@ -913,11 +913,6 @@ struct ibmvnic_error_buff {
 	__be32 error_id;
 };
 
-struct ibmvnic_inflight_cmd {
-	union ibmvnic_crq crq;
-	struct list_head list;
-};
-
 struct ibmvnic_adapter {
 	struct vio_dev *vdev;
 	struct net_device *netdev;
@@ -978,10 +973,6 @@ struct ibmvnic_adapter {
 
 	struct completion fw_done;
 
-	/* in-flight commands that allocate and/or map memory*/
-	struct list_head inflight;
-	spinlock_t inflight_lock;
-
 	/* partner capabilities */
 	u64 min_tx_queues;
 	u64 min_rx_queues;