linux-kernel - Re: [PATCH 1/2] don't wait on disk to start on resume

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Message-ID: <1359671257.7527.4.camel@dabdike>
Date:	Fri, 01 Feb 2013 09:27:37 +1100
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	"dbasehore ." <dbasehore@...omium.org>
Cc:	Sergei Shtylyov <sshtylyov@...sta.com>, jgarzik@...ox.com,
	linux-ide@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH 1/2] don't wait on disk to start on resume

On Thu, 2013-01-31 at 14:00 -0800, dbasehore . wrote:
> (Resending as plain text so the message is tracked on vger)
> 
> Hi, thanks for reading through my patch.
> 
> With regards to SCSI_SENSE_BUFFERSIZE, I'm following the precedent of
> scsi_execute_req found in drivers/scsi/scsi_lib.c

I have no context for this: I don't recall making any comment on sense
buffers; what are you replying to?

James

> It seems that it is used by the scsi_normalize_sense function which I
> call in sd_resume_async. I just input SCSI_SENSE_BUFFERSIZE directly
> there though. I didn't know if anything would change its behavior on a
> lower level if I made sense_len = SCSI_SENSE_BUFFERSIZE, so I just
> went with what was already done.
> 
> I'll make sure the semantic fixes go into the final patch.
> 
> Also, I forgot to mention one possible problem earlier. I understand
> that some hard drives have a command buffer that can be executed by
> the hard drive in an order it determines. Does anyone know of a
> potential problem if the following happens?
> 
> -resume finishes (hard drive not started yet)
> -read/write sent to disk, inserted before start command
> 
> Could this happen? If so, could it cause any problems?
> 
> I've tested the possibility of a program trying to read/write from the
> disk before it has started, and the read/write blocks until the disk
> has actually been spun up. I don't know if there are specific hard
> drives where this could be a problem though.
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