Le 13/07/2015 16:11, Kristian Evensen a écrit :
Hello,
I have a quick question about this patch.
On Wed, May 13, 2015 at 2:19 PM, Nicolas Dichtel
<nicolas.dich...@6wind.com> wrote:
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 837d30b5ffed..7b25f1ef3d75 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2415,6 +2415,9 @@ void rtmsg_ifinfo(int type, struct net_device *dev,
unsigned int change,
{
struct sk_buff *skb;
+ if (dev->reg_state != NETREG_REGISTERED)
+ return;
+
Is this check correct, or placed at the correct location? The reason I
am asking is as follows. In rollback_registered_many(), dev->reg_state
is set to NETREG_UNREGISTERING for devices that will be unregistered.
When rtmsg_ifinfo_build_skb(RTM_DELLINK, ...) is called in the
following loop in rollback_registered_many, this comparison will
always be true and no DELLINK event generated.
This change led to some applications I have not behaving as expected
due to missing DELLINK when network devices are removed. I also see no
DELLINK with ip mon link. Removing the check restores the old behavior
(DELLINK events are generated). My machine is running 3.18.18, which
includes this fix.
Ok, I see the problem. My patch depends on commit
395eea6ccf2b ("rtnetlink: delay RTM_DELLINK notification until after
ndo_uninit()")
which has been introduced in 3.19 (this patch is not backported in 3.18).
After 3.19, rtmsg_ifinfo_build_skb() just builds a message (an skb), it never
calls rtmsg_ifinfo(). After this call, rollback_registered_many() calls
rtmsg_ifinfo_send() (which also never calls rtmsg_ifinfo()).
I will submit a patch for the 3.18.
Regards,
Nicolas
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