linux-kernel - Re: [PATCH repost 3] [SCSI] Retrieve the Caching mode page

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Message-ID: <589506.10541.qm@web31809.mail.mud.yahoo.com>
Date:	Tue, 23 Nov 2010 01:25:23 -0800 (PST)
From:	Luben Tuikov <ltuikov@...oo.com>
To:	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-usb@...r.kernel.org, Greg KH <greg@...ah.com>,
	James Bottomley <James.Bottomley@...e.de>
Subject: Re: [PATCH repost 3] [SCSI] Retrieve the Caching mode page

--- On Mon, 11/22/10, Matthew Dharm <mdharm-kernel@...-eyed-alien.net> wrote:

> As long as you are not changing the command stream that the
> devices see, I
> think this is a reasonable risk to take.

No, not at all.

> What are the consequences if the device returns what appear
> to be a Caching
> Mode Page, but it is actually filled with garbage or
> otherwise inaccurate
> data?

Data corruption would be no different than when determining whether the media is write protected or determining other parameters. A similar question would be "What would the consequences be if the device misreported the media write-protect bit?" I suppose such a device would be quite broken and inoperative.

   Luben

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