Re: [PATCH 1/1] UIO: Add a write() function to enable/disable interrupts

Uwe Kleine-König
2008-06-04T06:30:24Z

Hello Hans-Jürgen,

> Sometimes it is necessary to enable/disable the interrupt of a UIO device
> from the userspace part of the driver. With this patch, the UIO kernel driver
> can implement an "irqcontrol()" function that does this. Userspace can write
> an s32 value to /dev/uioX (usually 0 or 1 to turn the irq off or on). The
> UIO core will then call the driver's irqcontrol function.
IMHO it would make sense to demand that irqcontrol() is idempotent and
then call irqcontrol(ON) before blocking in read and poll.

Best regards
Uwe

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Uwe Kleine-König, Software Engineer
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