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From b9284f535e93c337ab21f330753e60e1038f9a27 Mon Sep 17 00:00:00 2001
From: Helmut Schaa <helmut.schaa@googlemail.com>
Date: Wed, 8 Jan 2014 13:48:49 +0100
Subject: [PATCH 2/2] netdev-linux: Let interface flag survive internal port
setup
Due to a race condition when bringing up an internal port on Linux
some interface flags (e.g. IFF_MULTICAST) are falsely reset. This
happens because netlink events may be processed after the according
netdev has been brought up (which sets interface flags).
Fix this by reading the interface flags just before updating them
if they have not been updated by from the kernel yet.
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
---
lib/netdev-linux.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/lib/netdev-linux.c b/lib/netdev-linux.c
index 9eaac33..423e72e 100644
--- a/lib/netdev-linux.c
+++ b/lib/netdev-linux.c
@@ -2712,7 +2712,13 @@ update_flags(struct netdev_linux *netdev, enum netdev_flags off,
unsigned int old_flags, new_flags;
int error = 0;
- old_flags = netdev->ifi_flags;
+ if (!(netdev->cache_valid & VALID_DRVINFO)) {
+ /* Most likely the debvice flags are not in sync yet, fetch them now */
+ get_flags(&netdev->up, &old_flags);
+ } else {
+ old_flags = netdev->ifi_flags;
+ }
+
*old_flagsp = iff_to_nd_flags(old_flags);
new_flags = (old_flags & ~nd_to_iff_flags(off)) | nd_to_iff_flags(on);
if (new_flags != old_flags) {
--
1.8.1.4