Re: Is it useful to support user level drivers

[Matthias Urlichs]

At 14:28 +0100 2001-06-21, Alan Cox wrote:
>No. The IRQ might be shared, and you get a slight problem if you just disabled
>an IRQ needed to make progress for user space to handle the IRQ

Two choices:

- Disallow shared interrupts for usermode drivers.

- Make the 'generic interrupt handler device driver' configurable 
and/or module-extensible. You only need three entry points 
("Interrupt set?"/"Enable interrupts"/"Disable interrupts"), which is 
reasonably simple to get right.
-- 
Matthias Urlichs
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/