Alan Cox wrote: >> Maybe we could set a limit here. If the ATAPI device keeps DRQ=1 and >> exceeds the limit, we consider it as HSM violation and have EH handle it. > > On a DMA transfer its basically out of our control (and a PIO drain will > lock some controllers solid until power cycle), Do such controllers lock up on PIO draining after PIO transfers too? Can you tell which are those controllers? > but on PIO we know we > never set a chunk size over 64K, so if we exceed 64K its time to apply a > larger hammer Draining is related to the amount of data the drive responds not to the chunk size. I agree 64k should be enough for most cases but I think there can be corner cases where this doesn't hold. 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
