From: Paul Durrant <pdurrant@amazon.com>
Date: Tue, 11 Aug 2020 08:01:57 +0000 (+0100)
Subject: tools/hotplug/Linux: add remove_from_bridge()
X-Git-Tag: archive/raspbian/4.16.0+51-g0941d6cb-1+rpi1~2^2~42^2~1733
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=bb13d936d2500f303c8fbf9420da9ed340818294;p=xen.git

tools/hotplug/Linux: add remove_from_bridge()

This patch adds a remove_from_bridge() function into xen-network-common.sh
to partner with the existing add_to_bridge() function. The vif-bridge
script is then modified to use it.

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Acked-by: Wei Liu <wl@xen.org>
---

diff --git a/tools/hotplug/Linux/vif-bridge b/tools/hotplug/Linux/vif-bridge
index e722090ca8..c3e409926d 100644
--- a/tools/hotplug/Linux/vif-bridge
+++ b/tools/hotplug/Linux/vif-bridge
@@ -84,12 +84,7 @@ case "$command" in
         ;;
 
     offline)
-        if which brctl >&/dev/null; then
-            do_without_error brctl delif "$bridge" "$dev"
-        else
-            do_without_error ip link set "$dev" nomaster
-        fi
-        do_without_error ifconfig "$dev" down
+        remove_from_bridge "$bridge" "$dev"
         ;;
 
     add)
diff --git a/tools/hotplug/Linux/xen-network-common.sh b/tools/hotplug/Linux/xen-network-common.sh
index ec3bd4ec4a..6a0904361f 100644
--- a/tools/hotplug/Linux/xen-network-common.sh
+++ b/tools/hotplug/Linux/xen-network-common.sh
@@ -141,6 +141,25 @@ add_to_bridge () {
     ip link set dev ${dev} up
 }
 
+remove_from_bridge () {
+    local bridge=$1
+    local dev=$2
+
+    do_without_error ip link set dev ${dev} down
+
+    # Don't remove $dev from $bridge if it's not on the bridge.
+    if [ -e "/sys/class/net/${bridge}/brif/${dev}" ]; then
+        log debug "removing $dev from bridge $bridge"
+        if which brctl >&/dev/null; then
+            do_without_error brctl delif ${bridge} ${dev}
+        else
+            do_without_error ip link set ${dev} nomaster
+        fi
+    else
+        log debug "$dev not on bridge $bridge"
+    fi
+}
+
 # Usage: set_mtu bridge dev
 set_mtu () {
     local bridge=$1