On 01/19/2011 03:29 PM, Maksim Rayskiy wrote:

quoted

A kernel modification might not even be needed.

Have you tried simply issuing READ VERIFY via bsg, and not caring if it
completes?  bsg should be able to handle an app submitting a command, but
never checking the 'done' list, right?  A simple shell app could execute

        write(bsg_fd, ... SCSI READ VERIFY command ...)
        exit(0)

to avoid waiting for READ VERIFY command completion, I would hope.

        Jeff

My question was how to speed up system resume when he the spinup
request is coming from sd_resume(). For shell method to work I would
have to ignore this request entirely and do READ VERIFY when system is
fully restored.
Can it be done without kernel modification? Tejun mentioned using
manage_start_stop flag but had some reservations against it.

Oh, if we're talking about sd_resume(), SCSI definitely has an internal 
mechanism to fire off a request, without blocking and waiting for a 
response.  It does sound like a kernel modification, but it should be 
straightforward via existing APIs.

	Jeff