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37 lines
1.4 KiB
37 lines
1.4 KiB
From 974dc36a87274d7bae13e7dddd3364fecf5b3e7c Mon Sep 17 00:00:00 2001
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From: Helmut Schaa <helmut.schaa@googlemail.com>
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Date: Wed, 8 Jan 2014 13:48:49 +0100
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Subject: [PATCH] netdev-linux: Let interface flag survive internal port setup
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Due to a race condition when bringing up an internal port on Linux
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some interface flags (e.g. IFF_MULTICAST) are falsely reset. This
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happens because netlink events may be processed after the according
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netdev has been brought up (which sets interface flags).
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Fix this by reading the interface flags just before updating them
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if they have not been updated by from the kernel yet.
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Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
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---
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lib/netdev-linux.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/lib/netdev-linux.c b/lib/netdev-linux.c
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index fe7fb9b29..63407ba1b 100644
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--- a/lib/netdev-linux.c
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+++ b/lib/netdev-linux.c
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@@ -3469,7 +3469,13 @@ update_flags(struct netdev_linux *netdev, enum netdev_flags off,
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unsigned int old_flags, new_flags;
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int error = 0;
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- old_flags = netdev->ifi_flags;
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+ if (!(netdev->cache_valid & VALID_DRVINFO)) {
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+ /* Most likely the debvice flags are not in sync yet, fetch them now */
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+ get_flags(&netdev->up, &old_flags);
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+ } else {
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+ old_flags = netdev->ifi_flags;
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+ }
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+
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*old_flagsp = iff_to_nd_flags(old_flags);
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new_flags = (old_flags & ~nd_to_iff_flags(off)) | nd_to_iff_flags(on);
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if (new_flags != old_flags) {
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