Tejun Heo wrote:
Well, the port-exclusive case is dumb but understandable; however, sata_via (vt8237) takes it to the next level and may lock up if any available port in the host_set is active when a SCR reg is accessed, so it needs host_set-exclusive version. It took me two days of boredom to figure out that things can be made THAT dumb. Their new AHCI controller also seems to require host_set-wide EH ops to recover from errors. Well, I guess they consider requiring host_set-wide ops a feature or something. :-( Note that this means that the current libata EH may lock up the whole machine on vt8237 if EH occurs at a bad time.
Update: vt8237 failed to survive over-night test. It died even with host_set-wide exclusion. I'm dropping hp-poll support from sata_via.
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