RE: [PATCH v4 11/12] Drivers: hv: vmbus: Suspend after cleaning up hv_sock and sub channels

[Michael Kelley]

From: Dexuan Cui <decui@xxxxxxxxxxxxx> Sent: Monday, September 2, 2019 5:23 PM
> 
> 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@xxxxxxxxxxxxx>
> ---
>  drivers/hv/channel_mgmt.c | 26 ++++++++++++++++++++++++++
>  drivers/hv/connection.c   |  3 +++
>  drivers/hv/hyperv_vmbus.h | 12 ++++++++++++
>  drivers/hv/vmbus_drv.c    | 44 +++++++++++++++++++++++++++++++++++++++++++-
>  4 files changed, 84 insertions(+), 1 deletion(-)
> 

Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>