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

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Message-ID: <CACVXFVMeUmLh=Tu3PHbgHQNX+c-z50_CoAkdJS_uCw=E3dO2dw@mail.gmail.com>
Date:	Sat, 18 Aug 2012 08:58:39 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Bjørn Mork <bjorn@...k.no>,
	Oliver Neukum <oneukum@...e.de>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	"linux-usb@...r.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()

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.


Thanks,
-- 
Ming Lei
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