Fajun Chen wrote:
I assume that alt status register will be updated when pata/sata is back online. So as an alternative and less invasive way, could I check alt status register and start user scan only if device is ready on alt status register? libata has ata_altstatus() function, is it available to user space? If not, may I expose it? I'm looking for a way to check device registers without side effects.
You can't use alt status that way. Not all controllers have them and even those which do show different behaviors over hotplug/unplugs.
Hmmm... maybe making userscan synchronous is the correct way to do it. I'll give it some thoughts.
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