summaryrefslogtreecommitdiff
path: root/udevdb.c
diff options
context:
space:
mode:
authorkay.sievers@vrfy.org <kay.sievers@vrfy.org>2004-10-05 21:35:39 -0700
committerGreg KH <gregkh@suse.de>2005-04-26 21:37:02 -0700
commita8b5267a629f21c30d4e94ec82be193009803ddd (patch)
tree49b2163c6841dd437d7b1112b0df990dab5faf32 /udevdb.c
parent01f950e2eb86563255a269ecadd386cbe5361d0c (diff)
[PATCH] finally solve the bad sysfs-timing for all of us
On Tue, Sep 21, 2004 at 07:17:34PM +0200, Kay Sievers wrote: > During the integration of HAL into the linux hotplug system, we dicover > every week a new signaling path that fails cause of the delayed > population of the sysfs files, which are connected by symlinks and > appear in something like a random order in userspace. > > It's pretty complicated to understand the connection between all these > files for all the different subsystems with all the exceptions, so most > of the users simply sleep a few seconds, but that is not acceptable for > our integration work. > > Here I try to get all the special knowledge about that behavior together > and place that in a simple binary. That program _must_ run first of all > other hotplug processsing and every later script, udev or HAL all can get > rid of the wild guesses about the right time sysfs is ready. > > It will not only wait for the "dev"-file events we handle with udev, also > for every /device-device with the corresponding bus link. > > It is provided as a patch against the current udev tree and a "install" will > place the new program in the hotplug.d directory: > > [kay@pim ~]$ tree /etc/hotplug.d/ > /etc/hotplug.d/ > `-- default > |-- 00-wait_for_sysfs.hotplug -> /sbin/wait_for_sysfs > |-- 10-udev.hotplug -> /sbin/udevsend > |-- 20-hal.hotplug -> /usr/libexec/hal.hotplug > |-- default.hotplug > `-- log.hotplug > > > For now, it logs the result of the waiting to syslog, to catch any > device, that needs special treatment. All newly discovered delay problems, > device black/whitelist updates should go into that program and we may remove > that kind of specialisation from all the other hotplug programs. > > Any patches, reports, testing is more than welcome. > > Sample debug: > Sep 21 18:44:07 localhost kernel: usb 3-2: new full speed USB device using address 12 > Sep 21 18:44:07 localhost kernel: hub 3-2:1.0: USB hub found > Sep 21 18:44:07 localhost kernel: hub 3-2:1.0: 2 ports detected > Sep 21 18:44:07 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2' > Sep 21 18:44:07 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.0' > Sep 21 18:44:08 localhost kernel: usb 3-2.1: new full speed USB device using address 13 > Sep 21 18:44:08 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/class/usb/lp0' > Sep 21 18:44:08 localhost kernel: drivers/usb/class/usblp.c: usblp0: USB Bidirectional printer dev 13 if 0 alt 1 proto 2 vid 0x067B pid 0x2305 > Sep 21 18:44:08 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2.1/3-2.1:1.0' > Sep 21 18:44:08 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2.1' > Sep 21 18:44:08 localhost udev: configured rule in '/etc/udev/rules.d/50-udev.rules' at line 29 applied, 'lp0' becomes 'usb/%k' > Sep 21 18:44:08 localhost udev: creating device node '/udev/usb/lp0' > Sep 21 18:44:09 localhost kernel: usb 3-2.2: new full speed USB device using address 14 > Sep 21 18:44:09 localhost kernel: pl2303 3-2.2:1.0: PL-2303 converter detected > Sep 21 18:44:09 localhost kernel: usb 3-2.2: PL-2303 converter now attached to ttyUSB0 > Sep 21 18:44:09 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2.2' > Sep 21 18:44:09 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2.2/3-2.2:1.0' > Sep 21 18:44:09 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2.2/3-2.2:1.0/ttyUSB0' > Sep 21 18:44:09 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/class/tty/ttyUSB0' > Sep 21 18:44:09 localhost udev: creating device node '/udev/ttyUSB0' New version with more devices excluded from /device-link saerch and a better maching for device names.
Diffstat (limited to 'udevdb.c')
0 files changed, 0 insertions, 0 deletions