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Date: Tue, 1 Mar 2022 15:18:21 -0500 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>, Paul Durrant <paul@....org>, Jakub Kicinski <kuba@...nel.org>, Sasha Levin <sashal@...nel.org>, wei.liu@...nel.org, davem@...emloft.net, xen-devel@...ts.xenproject.org, netdev@...r.kernel.org Subject: [PATCH AUTOSEL 5.10 09/14] Revert "xen-netback: remove 'hotplug-status' once it has served its purpose" From: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com> [ Upstream commit 0f4558ae91870692ce7f509c31c9d6ee721d8cdc ] This reverts commit 1f2565780e9b7218cf92c7630130e82dcc0fe9c2. The 'hotplug-status' node should not be removed as long as the vif device remains configured. Otherwise the xen-netback would wait for re-running the network script even if it was already called (in case of the frontent re-connecting). But also, it _should_ be removed when the vif device is destroyed (for example when unbinding the driver) - otherwise hotplug script would not configure the device whenever it re-appear. Moving removal of the 'hotplug-status' node was a workaround for nothing calling network script after xen-netback module is reloaded. But when vif interface is re-created (on xen-netback unbind/bind for example), the script should be called, regardless of who does that - currently this case is not handled by the toolstack, and requires manual script call. Keeping hotplug-status=connected to skip the call is wrong and leads to not configured interface. More discussion at https://lore.kernel.org/xen-devel/afedd7cb-a291-e773-8b0d-4db9b291fa98@ipxe.org/T/#u Signed-off-by: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com> Reviewed-by: Paul Durrant <paul@....org> Link: https://lore.kernel.org/r/20220222001817.2264967-1-marmarek@invisiblethingslab.com Signed-off-by: Jakub Kicinski <kuba@...nel.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/net/xen-netback/xenbus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c index 94d19158efc18..7acf3940dc1ff 100644 --- a/drivers/net/xen-netback/xenbus.c +++ b/drivers/net/xen-netback/xenbus.c @@ -256,6 +256,7 @@ static void backend_disconnect(struct backend_info *be) unsigned int queue_index; xen_unregister_watchers(vif); + xenbus_rm(XBT_NIL, be->dev->nodename, "hotplug-status"); #ifdef CONFIG_DEBUG_FS xenvif_debugfs_delif(vif); #endif /* CONFIG_DEBUG_FS */ @@ -675,7 +676,6 @@ static void hotplug_status_changed(struct xenbus_watch *watch, /* Not interested in this watch anymore. */ unregister_hotplug_status_watch(be); - xenbus_rm(XBT_NIL, be->dev->nodename, "hotplug-status"); } kfree(str); } -- 2.34.1
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