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authorDexuan Cui <decui@microsoft.com>2019-09-05 23:01:21 +0000
committerSasha Levin <sashal@kernel.org>2019-09-06 14:52:44 -0400
commitb307b38962eb0f22d1aa6dcf53cb7d3c2ed5eec7 (patch)
tree38f55d99f6960a7738cb8af94ce4837de60b2444 /drivers/hv/hyperv_vmbus.h
parent1f48dcf180e5422b1a633b24680dd0f5c3f540f5 (diff)
downloadlinux-b307b38962eb0f22d1aa6dcf53cb7d3c2ed5eec7.tar.bz2
Drivers: hv: vmbus: Suspend after cleaning up hv_sock and sub channels
Before suspend, Linux must make sure all the hv_sock channels have been properly cleaned up, because a hv_sock connection can not persist across hibernation, and the user-space app must be properly notified of the state change of the connection. Before suspend, Linux also must make sure all the sub-channels have been destroyed, i.e. the related channel structs of the sub-channels must be properly removed, otherwise they would cause a conflict when the sub-channels are recreated upon resume. Add a counter to track such channels, and vmbus_bus_suspend() should wait for the counter to drop to zero. Signed-off-by: Dexuan Cui <decui@microsoft.com> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/hv/hyperv_vmbus.h')
-rw-r--r--drivers/hv/hyperv_vmbus.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index e657197a027a..974b747ca1fc 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -260,6 +260,18 @@ struct vmbus_connection {
struct workqueue_struct *work_queue;
struct workqueue_struct *handle_primary_chan_wq;
struct workqueue_struct *handle_sub_chan_wq;
+
+ /*
+ * The number of sub-channels and hv_sock channels that should be
+ * cleaned up upon suspend: sub-channels will be re-created upon
+ * resume, and hv_sock channels should not survive suspend.
+ */
+ atomic_t nr_chan_close_on_suspend;
+ /*
+ * vmbus_bus_suspend() waits for "nr_chan_close_on_suspend" to
+ * drop to zero.
+ */
+ struct completion ready_for_suspend_event;
};