From: Vitaly Kuznetsov Date: Sun, 12 Apr 2015 01:07:46 +0000 (-0700) Subject: Drivers: hv: util: introduce state machine for util drivers X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=636c88da6df3bb2f978b48d3a7ed55423da84d19;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git Drivers: hv: util: introduce state machine for util drivers KVP/VSS/FCOPY drivers work in fully serialized mode: we wait till userspace daemon registers, wait for a message from the host, send this message to the daemon, get the reply, send it back to host, wait for another message. Introduce enum hvutil_device_state to represend this state in all 3 drivers. Signed-off-by: Vitaly Kuznetsov Tested-by: Alex Ng Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h index 2f30456d90a5..138d6634c79d 100644 --- a/drivers/hv/hyperv_vmbus.h +++ b/drivers/hv/hyperv_vmbus.h @@ -755,4 +755,13 @@ static inline void hv_poll_channel(struct vmbus_channel *channel, cb(channel); } +enum hvutil_device_state { + HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */ + HVUTIL_READY, /* userspace is registered */ + HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */ + HVUTIL_USERSPACE_REQ, /* request to userspace was sent */ + HVUTIL_USERSPACE_RECV, /* reply from userspace was received */ + HVUTIL_DEVICE_DYING, /* driver unload is in progress */ +}; + #endif /* _HYPERV_VMBUS_H */