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    SubjectRe: [PATCH v5 8/8] rpmsg: Turn name service into a stand alone driver
    On Fri, Nov 06, 2020 at 03:00:28PM +0100, Guennadi Liakhovetski wrote:
    > On Fri, Nov 06, 2020 at 02:15:45PM +0100, Guennadi Liakhovetski wrote:
    > > Hi Mathieu, Arnaud,
    > >
    > > On Thu, Nov 05, 2020 at 03:50:28PM -0700, Mathieu Poirier wrote:
    > > > From: Arnaud Pouliquen <arnaud.pouliquen@st.com>
    > > >
    > > > Make the RPMSG name service announcement a stand alone driver so that it
    > > > can be reused by other subsystems. It is also the first step in making the
    > > > functionatlity transport independent, i.e that is not tied to virtIO.
    > >
    > > Sorry, I just realised that my testing was incomplete. I haven't tested
    > > automatic module loading and indeed it doesn't work. If rpmsg_ns is loaded
    > > it probes and it's working, but if it isn't loaded and instead the rpmsg
    > > bus driver is probed (e.g. virtio_rpmsg_bus), calling
    > > rpmsg_ns_register_device() to create a new rpmsg_ns device doesn't cause
    > > rpmsg_ns to be loaded.
    >
    > A simple fix for that is using MODULE_ALIAS("rpmsg:rpmsg_ns"); in rpmsg_ns.c
    > but that alone doesn't fix the problem completely - the module does load then
    > but not quickly enough, the NS announcement from the host / remote arrives
    > before rpmsg_ns has properly registered. I think the best solution would be
    > to link rpmsg_ns.c together with rpmsg_core.c. You'll probably want to keep
    > the module name, so you could rename them to just core.c and ns.c.

    I'm pretty sure it is because virtio_device_ready() in rpmsg_probe() is called
    before the kernel has finished loading the name space driver. There has to be
    a way to prevent that from happening - I will investigate further.

    Thanks for reporting this,
    Mathieu

    >
    > Thanks
    > Guennadi

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