Messages in this thread | | | Date | Wed, 2 Jul 2008 13:42:24 +0200 | From | Uwe Kleine-König <> | Subject | Re: [PATCH] uio: User IRQ Mode |
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Alan Cox wrote: > On Wed, 02 Jul 2008 19:59:51 +0900 > Magnus Damm <magnus.damm@gmail.com> wrote: > > > From: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com> > > > > This patch adds a "User IRQ Mode" to UIO. In this mode the user space driver > > is responsible for acknowledging and re-enabling the interrupt. > > Shared interrupts are not supported by this mode. > > This doesn't work even for some non shared interrupts. > > If I take a level triggered interrupt then the IRQ handler code must > clear the IRQ before the line can be unmasked. Note that the irq is disabled instead of acked. So this should not be a problem. The userspace part then is responsible to ack (first) and unmask the irq.
This mis-understanding might be a hint to improve the commit log ...
Best regards Uwe
-- Uwe Kleine-König, Software Engineer Digi International GmbH Branch Breisach, Küferstrasse 8, 79206 Breisach, Germany Tax: 315/5781/0242 / VAT: DE153662976 / Reg. Amtsgericht Dortmund HRB 13962 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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