[PATCH v2 4.7 7/8] net/ncsi: Introduce ncsi_stop_dev()

[Gavin Shan]

This introduces ncsi_stop_dev(), as counterpart to ncsi_start_dev(),
to stop the NCSI device so that it can be reenabled in future. This
API should be called when the network device driver is going to
shutdown the device. There are 3 things done in the function: Stop
the channel monitoring; Reset channels to inactive state; Report
NCSI link down.

Signed-off-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
---
 include/net/ncsi.h     |  5 +++++
 net/ncsi/ncsi-manage.c | 33 ++++++++++++++++++++++-----------
 2 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/include/net/ncsi.h b/include/net/ncsi.h
index 1dbf42f..68680ba 100644
--- a/include/net/ncsi.h
+++ b/include/net/ncsi.h
@@ -31,6 +31,7 @@ struct ncsi_dev {
 struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
 				   void (*notifier)(struct ncsi_dev *nd));
 int ncsi_start_dev(struct ncsi_dev *nd);
+void ncsi_stop_dev(struct ncsi_dev *nd);
 void ncsi_unregister_dev(struct ncsi_dev *nd);
 #else /* !CONFIG_NET_NCSI */
 static inline struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
@@ -44,6 +45,10 @@ static inline int ncsi_start_dev(struct ncsi_dev *nd)
 	return -ENOTTY;
 }
 
+static void ncsi_stop_dev(struct ncsi_dev *nd)
+{
+}
+
 static inline void ncsi_unregister_dev(struct ncsi_dev *nd)
 {
 }
diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
index 1b797c9..6a96873 100644
--- a/net/ncsi/ncsi-manage.c
+++ b/net/ncsi/ncsi-manage.c
@@ -1161,9 +1161,7 @@ EXPORT_SYMBOL_GPL(ncsi_register_dev);
 int ncsi_start_dev(struct ncsi_dev *nd)
 {
 	struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
-	struct ncsi_package *np;
-	struct ncsi_channel *nc;
-	int old_state, ret;
+	int ret;
 
 	if (nd->state != ncsi_dev_state_registered &&
 	    nd->state != ncsi_dev_state_functional)
@@ -1175,9 +1173,27 @@ int ncsi_start_dev(struct ncsi_dev *nd)
 		return 0;
 	}
 
-	/* Reset channel's state and start over */
+	if (ndp->flags & NCSI_DEV_HWA)
+		ret = ncsi_enable_hwa(ndp);
+	else
+		ret = ncsi_choose_active_channel(ndp);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ncsi_start_dev);
+
+void ncsi_stop_dev(struct ncsi_dev *nd)
+{
+	struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
+	struct ncsi_package *np;
+	struct ncsi_channel *nc;
+	int old_state;
+
+	/* Stop the channel monitor and reset channel's state */
 	NCSI_FOR_EACH_PACKAGE(ndp, np) {
 		NCSI_FOR_EACH_CHANNEL(np, nc) {
+			ncsi_stop_channel_monitor(nc);
+
 			old_state = READ_ONCE(nc->state);
 			WRITE_ONCE(nc->state, NCSI_CHANNEL_INACTIVE);
 			WARN_ON_ONCE(!list_empty(&nc->link) ||
@@ -1185,14 +1201,9 @@ int ncsi_start_dev(struct ncsi_dev *nd)
 		}
 	}
 
-	if (ndp->flags & NCSI_DEV_HWA)
-		ret = ncsi_enable_hwa(ndp);
-	else
-		ret = ncsi_choose_active_channel(ndp);
-
-	return ret;
+	ncsi_report_link(ndp, true);
 }
-EXPORT_SYMBOL_GPL(ncsi_start_dev);
+EXPORT_SYMBOL_GPL(ncsi_stop_dev);
 
 void ncsi_unregister_dev(struct ncsi_dev *nd)
 {
-- 
2.1.0