net/ncsi: Reset channel state in ncsi_start_dev()

When the NCSI driver is stopped with ncsi_stop_dev() the channel
monitors are stopped and the state set to "inactive". However the
channels are still configured and active from the perspective of the
network controller. We should suspend each active channel but in the
context of ncsi_stop_dev() the transmit queue has been or is about to be
stopped so we won't have time to do so.

Instead when ncsi_start_dev() is called if the NCSI topology has already
been probed then call ncsi_reset_dev() to suspend any channels that were
previously active. This resets the network controller to a known state,
provides an up to date view of channel link state, and makes sure that
mode flags such as NCSI_MODE_TX_ENABLE are properly reset.

In addition to ncsi_start_dev() use ncsi_reset_dev() in ncsi-netlink.c
to update the channel configuration more cleanly.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 6 deletions

diff --git a/net/ncsi/ncsi-netlink.c b/net/ncsi/ncsi-netlink.c
index 33314381b4f5..cde48fe43dba 100644
--- a/net/ncsi/ncsi-netlink.c
+++ b/net/ncsi/ncsi-netlink.c
@@ -330,9 +330,9 @@ static int ncsi_set_interface_nl(struct sk_buff *msg, struct genl_info *info)
                     package_id, channel_id,
                     channel_id == NCSI_RESERVED_CHANNEL ? " (any)" : "");
 
-        /* Bounce the NCSI channel to set changes */
-        ncsi_stop_dev(&ndp->ndev);
-        ncsi_start_dev(&ndp->ndev);
+        /* Update channel configuration */
+        if (!(ndp->flags & NCSI_DEV_RESET))
+                ncsi_reset_dev(&ndp->ndev);
 
         return 0;
 }
@@ -360,9 +360,9 @@ static int ncsi_clear_interface_nl(struct sk_buff *msg, struct genl_info *info)
         spin_unlock_irqrestore(&ndp->lock, flags);
         netdev_info(ndp->ndev.dev, "NCSI: Cleared preferred package/channel\n");
 
-        /* Bounce the NCSI channel to set changes */
-        ncsi_stop_dev(&ndp->ndev);
-        ncsi_start_dev(&ndp->ndev);
+        /* Update channel configuration */
+        if (!(ndp->flags & NCSI_DEV_RESET))
+                ncsi_reset_dev(&ndp->ndev);
 
         return 0;
 }