disabling interrupts/scheduling in ioctl() handler

From: Ulrich Eckhardt (doomster_at_knuut.de)
Date: 03/30/04 

Date: Tue, 30 Mar 2004 11:29:16 +0200

Hi!
The topic already says almost all, I am accessing a dual-port RAM[1] and I
must not have a shared address selected for a longer time(because that
blocks accesses on the other side). Time constraints could live with
IRQs(possibly) but by no means with scheduling.
What is the preferred way to disable scheduling? Can that happen at all,
while in the ioctl() handler?

Another related question is about copy_to_user(): docs mention that this
might sleep, so I better avoid this function while in a section where I
must not be interrupted/scheduled, right?

thanks for your input,

Ulrich Eckhardt

[1] RAM with two address/data busses, one connected to the PCI bus, the
other to a microcontroller 

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