Alan Jenkins wrote: > On 8/7/09, Kay Sievers <kay.sievers@xxxxxxxx> wrote: > >> On Fri, Aug 7, 2009 at 16:48, Nigel Kukard<nkukard@xxxxxxxx> wrote: >> >> >>> I have a nice C proggie I'll including in bootutils, unless you guys are >>> interested in including it in udev?. Attached for anyone interested, >>> with timeout support. It can wait for a device or labeled device to come >>> up :) >>> >> It looks fine, but I guess it does nothing really else than: >> udevadm settle --exit-if-exists=/dev/disk/by-label/foo >> > > I think that still exits as soon as the queue becomes empty. Isn't > there a problem with usb devices being probed asynchronously? > > I'm thinking of the "rootwait" problem. The problem that is addressed > in-kernel by the "initdev" patches. Doesn't userspace (initramfs) > still have to deal with that? > I think you guys are missing the problem I'm having. This has nothing to do with USB, I don't use USB and don't load any USB modules. I've tried this out on 3 boxes using kernel 2.9.29.6 and udev 145. Here are the modules loaded ... ahci, piix, ide_core, ata_piix, pata_acpi, libata * I have a kernel with an initramfs, no disk controller modules are loaded at all before the initramfs fires up * My script is this .... examine pci bus & modprobe modules we need for disks fire up udev udev trigger udev settle mount LABEL=root Simple. Now .... that works in 141 fine, it does not in 145. If I do an ls /dev straight after settle, there are no sd* devices. If I add a sleep 5s after settle, the devices are there. udevadm settle exits after about 1 second, when I check the creation times on the devices it takes a few seconds, up to 5 depending on the speed of the box. Kay, you said yourself that settle does not wait until the events are fully processed and exits once they have been recieved by udev. This is EXACTLY what is happening in 145. You further said this is due to the speed improvements with 145 and I was just lucky in 141 and I should be waiting for the udev event that the device has been processed. I went over the chat logs again to make sure I'm not imagining things. This will not work ... udevadm settle --exit-if-exists=/dev/disk/by-label/foo , 'udevadm settle' exits BEFORE the device is created. -- To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
