Messages in this thread |  | | Date | Thu, 21 Jun 2001 21:20:54 +0700 | From | "Dmitry A. Fedorov" <> | Subject | Re: Is it useful to support user level drivers |
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On Thu, 21 Jun 2001, Alan Cox wrote:
> > Lastly an IRQ kernel module can disable_irq() from interrupt handler > > and enable it again only on explicit acknowledge from user. > > 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
Disabling the IRQ till user acknowledge is an option for particular device handling. Yes, IRQ sharing is impossible with it and IRQ module must reject setup requests with this option and SA_SHIRQ flag together. However, it is important for rare cases only with "bad" devices (their interrupt behaviour is really bad!) and IRQ sharing requirement.
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