* [PATCH AUTOSEL 5.10 13/21] xen-netback: Check for hotplug-status existence before watching
[not found] <20210419204420.6375-1-sashal@kernel.org>
@ 2021-04-19 20:44 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2021-04-19 20:44 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Michael Brown, Paul Durrant, David S . Miller, Sasha Levin,
xen-devel, netdev
From: Michael Brown <mbrown@fensystems.co.uk>
[ Upstream commit 2afeec08ab5c86ae21952151f726bfe184f6b23d ]
The logic in connect() is currently written with the assumption that
xenbus_watch_pathfmt() will return an error for a node that does not
exist. This assumption is incorrect: xenstore does allow a watch to
be registered for a nonexistent node (and will send notifications
should the node be subsequently created).
As of commit 1f2565780 ("xen-netback: remove 'hotplug-status' once it
has served its purpose"), this leads to a failure when a domU
transitions into XenbusStateConnected more than once. On the first
domU transition into Connected state, the "hotplug-status" node will
be deleted by the hotplug_status_changed() callback in dom0. On the
second or subsequent domU transition into Connected state, the
hotplug_status_changed() callback will therefore never be invoked, and
so the backend will remain stuck in InitWait.
This failure prevents scenarios such as reloading the xen-netfront
module within a domU, or booting a domU via iPXE. There is
unfortunately no way for the domU to work around this dom0 bug.
Fix by explicitly checking for existence of the "hotplug-status" node,
thereby creating the behaviour that was previously assumed to exist.
Signed-off-by: Michael Brown <mbrown@fensystems.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/xen-netback/xenbus.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 6f10e0998f1c..94d19158efc1 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -824,11 +824,15 @@ static void connect(struct backend_info *be)
xenvif_carrier_on(be->vif);
unregister_hotplug_status_watch(be);
- err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, NULL,
- hotplug_status_changed,
- "%s/%s", dev->nodename, "hotplug-status");
- if (!err)
+ if (xenbus_exists(XBT_NIL, dev->nodename, "hotplug-status")) {
+ err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch,
+ NULL, hotplug_status_changed,
+ "%s/%s", dev->nodename,
+ "hotplug-status");
+ if (err)
+ goto err;
be->have_hotplug_status_watch = 1;
+ }
netif_tx_wake_all_queues(be->vif->dev);
--
2.30.2
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