[xenial:linux-azure][PATCH 2/6] hv_netvsc: simplify function args in receive status path

[Marcelo Henrique Cerri]

From: Stephen Hemminger <stephen at networkplumber.org>

BugLink: http://bugs.launchpad.net/bugs/1864233

The caller (netvsc_receive) already has the net device pointer,
and should just pass that to functions rather than the hyperv device.
This eliminates several impossible error paths in the process.

Signed-off-by: Stephen Hemminger <sthemmin at microsoft.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(backported from commit 79cf1bae384cfc51b0b0773b3591794302af6ebd)
[marcelo.cerri at canonical.com: Fixed context]
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri at canonical.com>
---
 drivers/net/hyperv/hyperv_net.h   |  3 +--
 drivers/net/hyperv/netvsc.c       |  4 ++--
 drivers/net/hyperv/netvsc_drv.c   | 12 ++----------
 drivers/net/hyperv/rndis_filter.c |  9 +++------
 4 files changed, 8 insertions(+), 20 deletions(-)

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 9e8d0264a863..060ddd486bb3 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -199,7 +199,7 @@ int netvsc_send(struct net_device *net,
 		struct rndis_message *rndis_msg,
 		struct hv_page_buffer *page_buffer,
 		struct sk_buff *skb);
-void netvsc_linkstatus_callback(struct hv_device *device_obj,
+void netvsc_linkstatus_callback(struct net_device *net,
 				struct rndis_message *resp);
 int netvsc_recv_callback(struct net_device *net,
 			 struct vmbus_channel *channel,
@@ -221,7 +221,6 @@ int rndis_filter_set_rss_param(struct rndis_device *rdev,
 			       const u8 *key);
 int rndis_filter_receive(struct net_device *ndev,
 			 struct netvsc_device *net_dev,
-			 struct hv_device *dev,
 			 struct vmbus_channel *channel,
 			 void *data, u32 buflen);
 
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index c82fea28711a..f54b9847187d 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -1156,8 +1156,8 @@ static int netvsc_receive(struct net_device *ndev,
 		int ret;
 
 		/* Pass it to the upper layer */
-		ret = rndis_filter_receive(ndev, net_device, device,
-					      channel, data, buflen);
+		ret = rndis_filter_receive(ndev, net_device,
+					   channel, data, buflen);
 
 		if (unlikely(ret != NVSP_STAT_SUCCESS))
 			status = NVSP_STAT_FAIL;
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 3b2589210eac..d64c656f88b5 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -728,22 +728,14 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 /*
  * netvsc_linkstatus_callback - Link up/down notification
  */
-void netvsc_linkstatus_callback(struct hv_device *device_obj,
+void netvsc_linkstatus_callback(struct net_device *net,
 				struct rndis_message *resp)
 {
 	struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
-	struct net_device *net;
-	struct net_device_context *ndev_ctx;
+	struct net_device_context *ndev_ctx = netdev_priv(net);
 	struct netvsc_reconfig *event;
 	unsigned long flags;
 
-	net = hv_get_drvdata(device_obj);
-
-	if (!net)
-		return;
-
-	ndev_ctx = netdev_priv(net);
-
 	/* Update the physical link speed when changing to another vSwitch */
 	if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) {
 		u32 speed;
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 934f9901c50e..29e8741e1891 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -134,11 +134,9 @@ static void put_rndis_request(struct rndis_device *dev,
 	kfree(req);
 }
 
-static void dump_rndis_message(struct hv_device *hv_dev,
+static void dump_rndis_message(struct net_device *netdev,
 			       const struct rndis_message *rndis_msg)
 {
-	struct net_device *netdev = hv_get_drvdata(hv_dev);
-
 	switch (rndis_msg->ndis_msg_type) {
 	case RNDIS_MSG_PACKET:
 		netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "
@@ -406,7 +404,6 @@ static int rndis_filter_receive_data(struct net_device *ndev,
 
 int rndis_filter_receive(struct net_device *ndev,
 			 struct netvsc_device *net_dev,
-			 struct hv_device *dev,
 			 struct vmbus_channel *channel,
 			 void *data, u32 buflen)
 {
@@ -414,7 +411,7 @@ int rndis_filter_receive(struct net_device *ndev,
 	struct rndis_message *rndis_msg = data;
 
 	if (netif_msg_rx_status(net_device_ctx))
-		dump_rndis_message(dev, rndis_msg);
+		dump_rndis_message(ndev, rndis_msg);
 
 	switch (rndis_msg->ndis_msg_type) {
 	case RNDIS_MSG_PACKET:
@@ -429,7 +426,7 @@ int rndis_filter_receive(struct net_device *ndev,
 
 	case RNDIS_MSG_INDICATE:
 		/* notification msgs */
-		netvsc_linkstatus_callback(dev, rndis_msg);
+		netvsc_linkstatus_callback(ndev, rndis_msg);
 		break;
 	default:
 		netdev_err(ndev,
-- 
2.20.1