Matthew Wilcox wrote: > On Sat, Sep 08, 2007 at 05:10:27PM +0900, Tejun Heo wrote: >> I think it's generally okay although it would need to spend quite some >> time in -mm and we'll need to exclude several drivers which require >> host-wide silence for mode programming (the current code is buggy but >> sequential probing hides it pretty well) till host-wide exclusion is >> implemented. > > Can you tell me a bit more about these drivers? Would it be possible to > convert them to one host/many channels, which would give us the exclusion > we want? IIRC, sata_promise is of this type and there probably are a few old PATA ones. Ports on the host are mostly independent. There's no need for cross-port synchronization for most of the time but configuring transfer mode requires host-wide quiescence. Currently, the planned way to fix the problem is to implement host-wide exclusion mechanism in the error handler (summon EH of all other threads and wait till all of them are parked) and it's on top of the TODO list, so I don't think it will take too long. Thanks. -- tejun - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
