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8e609d5e7b
In the old days, we treated all interrupts from the legacy Apple home made interrupt controllers as level, with a trick reading the "level" register along with the "event" register to work arounds bugs where it would occasionally fail to latch some events. Doing so appeared to work fine for both level and edge interrupts. Later on, we discovered in Darwin source the magic masks that define which interrupts are actually level and which are edge, and implemented a different algorithm, more similar to what Apple does, that treats those differently. I recently discovered however that this caused problems (including loss of interrupts) with an old Wallstreet PowerBook when trying to use the internal modem (connected to a cascaded controller). It looks like some interrupts are treated as edge while they are really level and I'm starting to seriously doubt the correctness of the Darwin code (which has other obvious bugs when you read it, so ...) This patch reverts to our original behaviour of treating everything as a level interrupt. It appears to solve the problems with the modem on the Wallstreet and everything else seems to be working properly as well. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> |
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