linux-kernel - Re: BUG: unable to handle kernel paging request in usb_match

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Date:	Sun, 19 Aug 2012 12:23:38 +0200
From:	Bjørn Mork <bjorn@...k.no>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Oliver Neukum <oneukum@...e.de>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	"linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
	"Lan\, Tianyu" <tianyu.lan@...el.com>
Subject: Re: BUG: unable to handle kernel paging request in usb_match_id()

Ming Lei <tom.leiming@...il.com> writes:
> On Fri, Aug 17, 2012 at 10:42 PM, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
>> On Fri, Aug 17, 2012 at 10:38:16AM -0400, Alan Stern wrote:
>>> On Fri, 17 Aug 2012, Ming Lei wrote:
>>>
>>> > But,  if HOTPLUG is not enabled, should device_add() trigger driver probe
>>> > further after kernel init is completed?  Or even devices should be allowed
>>> > to add into system?
>>>
>>> Indeed, does it make any sense to have USB support at all if HOTPLUG
>>> isn't enabled?  Should USB select HOTPLUG?
>>
>> Well, a long time ago people wanted to use USB but not have HOTPLUG
>> enabled in their systems for various (odd) embedded systems.  As it's
>> pretty hard to even turn off HOTPLUG these days, I'd be more likely to
>> just remove CONFIG_HOTPLUG entirely given the dynamic nature of almost
>> all systems.
>
> It should make sense, otherwise all device id table should not use
> __devinit* markings. There are lots of pci driver usage on it.

You might want to start here then:

/**
 * DEFINE_PCI_DEVICE_TABLE - macro used to describe a pci device table
 * @_table: device table name
 *
 * This macro is used to create a struct pci_device_id array (a device table)
 * in a generic manner.
 */
#define DEFINE_PCI_DEVICE_TABLE(_table) \
        const struct pci_device_id _table[] __devinitconst



Bjørn
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