linux-kernel - Re: [PATCH] Missing usb_find

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Message-ID: <84144f020801240514m135789d4nc14586598f8b4aca@mail.gmail.com>
Date:	Thu, 24 Jan 2008 15:14:09 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Oliver Neukum" <oliver@...kum.org>
Cc:	"Wilco Beekhuizen" <wilcobeekhuizen@...il.com>,
	"Greg KH" <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Missing usb_find_device symbol from usb.c

Hi,

On Jan 24, 2008 2:58 PM, Oliver Neukum <oliver@...kum.org> wrote:
> So we put it into drivers/usb/misc
> Does that change the code?

Yes. It's assumes only one device is plugged in.

On Jan 24, 2008 2:58 PM, Oliver Neukum <oliver@...kum.org> wrote:
> How do you make a block device on top of this device? It has no notion
> of reading/writing arbitrary blocks. It operates on files.

So you don't make it a block device which is even simpler. Now
get_sb_bdev() will fail before attempting to read the superblock. In
iriverfs, we only need to check for USB_DEVICE_MAJOR and then look up
struct usb_device to make sure we're allowed to mount.

                        Pekka
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