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Change comment about isa_intr_establish() as discussed on tech-kern.

This commit is contained in:
leo 1998-11-30 12:57:10 +00:00
parent adbfb3777a
commit 7c72f9361b
1 changed files with 8 additions and 6 deletions
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14
sys/dev/isa/isavar.h
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@ -1,4 +1,4 @@
/* $NetBSD: isavar.h,v 1.34 1998/09/11 19:39:28 jonathan Exp $ */
/* $NetBSD: isavar.h,v 1.35 1998/11/30 12:57:10 leo Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
@ -186,11 +186,13 @@ struct isa_softc {
* To establish an ISA interrupt handler, a driver calls isa_intr_establish()
* with the interrupt number, type, level, function, and function argument of
* the interrupt it wants to handle. Isa_intr_establish() returns an opaque
* handle to an event descriptor if it succeeds, and invokes panic() if it
* fails. (XXX It should return NULL, then drivers should handle that, but
* what should they do?) Interrupt handlers should return 0 for "interrupt
* not for me", 1 for "I took care of it", or -1 for "I guess it was mine,
* but I wasn't expecting it."
* handle to an event descriptor if it succeeds, and returns NULL on failure.
* (XXX: some drivers can't handle this, since the former behaviour was to
* invoke panic() on failure). When the system does not accept any of the
* interrupt types supported by the driver, the driver should fail the attach.
* Interrupt handlers should return 0 for "interrupt not for me", 1 for
* "I took care of it", or -1 for "I guess it was mine, but I wasn't
* expecting it."
*
* To remove an interrupt handler, the driver calls isa_intr_disestablish()
* with the handle returned by isa_intr_establish() for that handler.