• Dexuan Cui's avatar
    Drivers: hv: vmbus: Ignore CHANNELMSG_TL_CONNECT_RESULT(23) · ddc9d357
    Dexuan Cui authored
    When a Linux hv_sock app tries to connect to a Service GUID on which no
    host app is listening, a recent host (RS3+) sends a
    CHANNELMSG_TL_CONNECT_RESULT (23) message to Linux and this triggers such
    a warning:
    
    unknown msgtype=23
    WARNING: CPU: 2 PID: 0 at drivers/hv/vmbus_drv.c:1031 vmbus_on_msg_dpc
    
    Actually Linux can safely ignore the message because the Linux app's
    connect() will time out in 2 seconds: see VSOCK_DEFAULT_CONNECT_TIMEOUT
    and vsock_stream_connect(). We don't bother to make use of the message
    because: 1) it's only supported on recent hosts; 2) a non-trivial effort
    is required to use the message in Linux, but the benefit is small.
    
    So, let's not see the warning by silently ignoring the message.
    Signed-off-by: default avatarDexuan Cui <decui@microsoft.com>
    Reviewed-by: default avatarMichael Kelley <mikelley@microsoft.com>
    Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
    ddc9d357
channel_mgmt.c 38 KB