i386: write IO APIC irq routing entries in correct order

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Since the "mask" bit is in the low word, when we write a new entry, we
need to write the high word first, before we potentially unmask it.

The exception is when we actually want to mask the interrupt, in which
case we want to write the low word first to make sure that the high word
doesn't change while the interrupt routing is still active.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

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Linus Torvalds 2006-11-01 10:05:35 -08:00

parent 130fe05dbc

commit f9dadfa71b

1 changed files with 23 additions and 3 deletions

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arch/i386/kernel/io_apic.c

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