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

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Message-ID: <AANLkTi=7tW6wqrk8ZkFuTYwmS-wZ4nQ+jkxk8U95H42F@mail.gmail.com>
Date:	Mon, 22 Nov 2010 09:07:51 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	ltuikov@...oo.com
Cc:	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, Nov 22, 2010 at 8:56 AM, Luben Tuikov <ltuikov@...oo.com> wrote:
>
> Some kernel transport drivers unconditionally disable
> retrieval of the Caching mode page. One such for example is
> the BBB/CBI transport over USB.

One reason for that is that historically we've seen devices that
simply go crazy - to the point of simply stopping to respond to
anything - when you ask for pages that Windows doesn't ask for.

It's especially common on USB storage, but it happens elsewhere too.
The device firmware simply hasn't ever been tested in that situation,
and it's buggy.

So I don't mind the patch per se, but I think it's potentially way
more dangerous than it looks.

                    Linus
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