On 11/20/2008 12:30:19 AM, Kay Sievers wrote:
On Thu, Nov 20, 2008 at 06:47, Karl O. Pinc <kop@xxxxxxxx> wrote:
> I've written a udev rule and am looking
> for comment by those with more experience
> to see if there are improvements to be made.
> KERNEL=="ttyUSB0", ACTION=="add", WAIT_FOR_SYSFS="subsystem/ttyUSB0"
The device you get the event for has only a single attribute, called
"dev" and there is never a need to wait for that. WAIT_FOR* is to work
around (in most cases broken and should be fixed) sysfs timing issues
in the kernel. Seems, there is nothing in your event where that would
be needed.
What are you trying to wait for?
I am trying to wait long enough that at startup the ldc4linux
daemon does not log the error:
Nov 19 16:15:00 mustard LCD4Linux[15799]: Pertelian: open(/dev/ttyUSB0)
failed: No such file or directory
It seems to work anyway, but I interpret the error to mean that
something in udev has not finished by the time the daemon
starts. I don't get the error if I start lcd4linux
manually after plugging in the lcd panel.
Thanks for the help.
Karl <kop@xxxxxxxx>
Free Software: "You don't pay back, you pay forward."
-- Robert A. Heinlein
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