linux-kernel - Re: [PATCH v2 1/1] usb: ulpi: ulpi_init should be executed in subsys

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Date:	Fri, 22 May 2015 15:50:47 +0800
From:	"Lu, Baolu" <baolu.lu@...ux.intel.com>
To:	David Cohen <david.a.cohen@...ux.intel.com>
CC:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	qiuxu.zhuo@...el.com
Subject: Re: [PATCH v2 1/1] usb: ulpi: ulpi_init should be executed in subsys_initcall



On 05/22/2015 02:46 PM, Lu, Baolu wrote:
>
>
> On 05/22/2015 11:11 AM, David Cohen wrote:
>> On Thu, May 21, 2015 at 08:09:54PM -0700, David Cohen wrote:
>>> Hi,
>>>
>>> On Fri, May 22, 2015 at 10:07:05AM +0800, Lu Baolu wrote:
>>>> Many drivers and modules depend on ULPI bus registeration to
>>>> register ULPI interfaces and drivers. It's more appropriate
>>>> to register ULPI bus in subsys_initcall instead of module_init.
>>>>
>>>> Kernel panic has been reported with some kind of kernel config.
>>> Even though I agree subsys_initcall is better to register ulpi bus, 
>>> it's
>>> still no excuse to have kernel panic. What about ULPI bus being 
>>> compiled
>>> as module?
>
> No kernel panic if ULPI is built as a module.
>
>>> IMHO this is avoiding the proper kernel panic fix which should be
>>> failing gracefully (or defer probe) from tusb1210 driver.
>> Maybe I need to express myself better :)
>> IMHO we should not consider work done with this patch only. It's still
>> incomplete.
>
> I am with you on that we should know the real problem.
>
> I could go ahead with further debugging. Do you have any suggestions
> about which direction should I go?

I forgot to mention that the panic was found in an Android environment.
The kernel version is  v4.1-rc3.

>
>>
>> Br, David
>
> Thank you,
> -Baolu
>
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