On 01/26/2011 09:08 AM, James Bottomley wrote:
I think better might be to move the eh thread functionality into block. What libata really wants is one eh thread per phy. It gets this by
[...]
machinery, everyone should get what they want, and libata could dispense with its current corruption of multiple SCSI hosts per physical bus attachment.
That's not the whole picture. libata originally chose one-host-per-port because that winds up being the best queueing/queue-busy arrangement for legacy IDE ports. They behave quite similarly to independent controllers -- even to the point of having separate irqs -- even though multiple IDE ports are shoehorned into a single PCI device.
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