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

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Message-ID: <CAGAzgspDkPUAHHES434t-nVnd_2WC5udV8=J=T4wbU3cwH-Gow@mail.gmail.com>
Date:	Thu, 31 Jan 2013 14:32:10 -0800
From:	"dbasehore ." <dbasehore@...omium.org>
To:	James Bottomley <James.Bottomley@...senpartnership.com>
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

That was a response to Sergei's message (which is properly tracked on
the lists).

On Thu, Jan 31, 2013 at 2:27 PM, James Bottomley
<James.Bottomley@...senpartnership.com> wrote:
> 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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>
>
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