Hi -- I notice in 2.4 kernels that there's a delay between completion of
"modprobe scanner" and when the device file can be successfully opened. I'm
working on code to power-up devices on-demand.
I've played some with making scripts to work around this, like
heyu turn on scanner
modprobe scanner
sleep 15
xsane
This is pretty gross, since I have to determine the "15" by playing with it,
and I'm sure it will fail some of the time unless I make it reeeeeally long. I
suspected this was some hardware issue -- USB latencies on device discovery, or
boot time for the scanner -- but a friend who isn't attempting to power-up his
devices says he sees the same behavior when just scripting "modprobe". So it
appears there's some fairly long delay in the kernel itself.
Anyone know off-hand what causes this delay, or if there's some way to get
the open() to block?
(btw, I'm not subscribed to the list).
b.c.
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This archive was generated by hypermail 2b29 : Sun Sep 15 2002 - 22:00:36 EST