Drivers: hv: fcopy: switch to using the hvutil_device_state state machine
Switch to using the hvutil_device_state state machine from using 3 different state variables: fcopy_transaction.active, opened, and in_hand_shake. State transitions are: -> HVUTIL_DEVICE_INIT when driver loads or on device release -> HVUTIL_READY if the handshake was successful -> HVUTIL_HOSTMSG_RECEIVED when there is a non-negotiation message from the host -> HVUTIL_USERSPACE_REQ after userspace daemon read the message -> HVUTIL_USERSPACE_RECV after/if userspace has replied -> HVUTIL_READY after we respond to the host -> HVUTIL_DEVICE_DYING on driver unload In hv_fcopy_onchannelcallback() process ICMSGTYPE_NEGOTIATE messages even when the userspace daemon is disconnected, otherwise we can make the host think we don't support FCOPY and disable the service completely. Signed-off-by: NVitaly Kuznetsov <vkuznets@redhat.com> Tested-by: NAlex Ng <alexng@microsoft.com> Signed-off-by: NK. Y. Srinivasan <kys@microsoft.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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