Re: [PATCH] libata: don't whine if ->prereset() returns -ENOENT

[Jeff Garzik <jeff@garzik.org>]

Tejun Heo wrote:
> ->prereset() returns -ENOENT to tell libata that the port is empty and
> reset sequencing should be stopped.  This is not an error condition.
> Update ata_eh_reset() such that it sets device classes to ATA_DEV_NONE
> and return success in on -ENOENT.  This makes spurious error message
> go away.
> 
> Signed-off-by: Tejun Heo <htejun@gmail.com>
> ---
> 
> This should do it and better fits the intention of the return value.
> Two things to note.
> 
> 1. I think these ports should be made dummy instead of returning
> -ENOENT on prereset().  -ENOENT from prereset() was a hack to keep
> ata_piix's behavior unchanged while converting it to new EH.  If no
> one objcts, I'll convert similar usages to use dummy ports after new
> init model and drop -ENOENT hack in #upstream.
> 
> 2. -ENODEV sounds more appropriate.  Why have I used -ENOENT.  :-)

applied