Re: [RFC] Deferred disk spinup during system resume

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> The taskfile you are to pass to the hardware is created in
> atapi_start_stop_xlat(), so you should not create a new taskfile in
> ata_eh_maybe_verify()

In order for resume to proceed without waiting for START to finish I
need to complete and release READ VERIFY qc immediately. I can
schedule EH action but it will be using a new qc and a new taskfile.

> It is a clear laying violation to call out from the middle of a command
> translation, to directly execute some EH actions.  Remember, this is the
> stage at which we are QUEUEING commands.  There may be other commands in the
> queue, or currently executing.  If someone sends a READ VERIFY, we do not
> want to IMMEDIATELY schedule EH, we want to execute an EH action when the
> READ VERIFY command is ready to be executed.
>
> It is quite incorrect to assume that READ VERIFY will only be sent to libata
> for execution during system resume.  The removal of READ VERIFY translation
> from ata_scsi_start_stop_xlat() is clearly wrong.
>

There is also ata_scsi_verify_xlat() that translates READ VERIFY.
How can I tell in ata_scsi_start_stop_xlat() if this particular
request is coming from system resume? Doesn't that mean I will have
defer all START requests? Or I need a separate command instead of
START_STOP to indicate that this request can be done asynchronously?

Thanks,
Maksim.
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