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

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Message-ID: <555ED0CF.3060903@linux.intel.com>
Date:	Fri, 22 May 2015 14:46:39 +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 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?

>
> Br, David

Thank you,
-Baolu

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