On Wed, Apr 11, 2012 at 21:41, Mark Hounschell <ma...@compro.net> wrote: > On 04/10/2012 09:10 AM, Kay Sievers wrote: >> >> On Tue, Apr 10, 2012 at 14:36, Mark Hounschell<ma...@compro.net> wrote: >> >>> I am having another issue with an out of kernel "GPL" device driver not >>> being available "on time" so to say. When the kernel discovers this pci >>> card >>> it loads it's kernel module and sets up the card for use. This takes >>> around >>> 15 seconds per card and there is usually 2-3 of them. When the card is >>> up, >>> running, and ready, the kernel module notifies udev who in turn executes >>> a >>> small script that creates 30 or so different device nodes for use with >>> the >>> card. >> >> >> A bit unrelated to the described specific problem above, but: >> >> We do not support any kernel device driver which does not create the >> device nodes on its own from inside the kernel. Such drivers cause >> problems and will fail for various non-interesting reasons. You really >> must hook up the kernel driver to register the devices with the kernel >> driver-core; it's just a few lines to add. >> >> Doing mknod() in userspace is just too fragile and does not fit into >> any synchronization logic of udev or systemd, it is not even expected >> to work reliably with these tools. > > > OK, I've changed the driver such that is creates it's own device nodes after > the board is up and running. Like I said earlier, it takes a single board > 10-15 seconds to come up once the driver starts it. There are now, no > scripts required, no sysvinit, no systemd, no udev involved.
Sounds cool. :) Udev and systemd are involved now, at least in a way that they see uevents, which did not exist before. > Still, when using systemd, when I get to my run-level, the application fails > because the device nodes have yet to be created. The driver is still waiting > for the boards to be ready. When I use sysvinit the device nodes are there > when I get to my run-level. Try: systemctl enable udev-settle.service Kay _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
