Tejun Heo wrote:
Hello, all. This is the fifth take of hotplug polling patchset. This take doesn't contain any real change than rebasing over the current upstream[U]. PMP patchset will be posted soon on top of this patchset and I wanted to avoid confusion by posting patchsets in order. As the name implies, this patchset implements hotplug by polling. hp-poll is used to * Monitor ports EH gave up. When EH gives up on a port, it freezes the port to protect the rest of the system from it. The user used to have to issue manual scan to retry the port. hp-poll can monitor such port and retry it when hotplug event is detected. This is also used by PMP support. * Support hotplug on controllers which can report hotplug conditions but cannot raise interrupt.
Patchset seems sane. I'll need to re-read patch #1 in depth, but I give everything a tentative ACK for now.
My biggest concern is power usage. On laptops for example, the 99% common case is that the user will never hot[un]plug a drive, so we shouldn't waste power bothering with poking disabled ports.
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