linux-kernel - Re: [PATCH v3 1/1] usb: ulpi: ulpi_init should be executed in subsys

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Date:	Wed, 27 May 2015 09:33:17 +0800
From:	"Lu, Baolu" <baolu.lu@...ux.intel.com>
To:	balbi@...com
CC:	David Cohen <david.a.cohen@...ux.intel.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/1] usb: ulpi: ulpi_init should be executed in subsys_initcall



On 05/26/2015 10:50 PM, Felipe Balbi wrote:
> Hi,
>
> On Mon, May 25, 2015 at 02:24:00PM +0800, Lu, Baolu wrote:
>>
>> On 05/23/2015 12:08 AM, David Cohen wrote:
>>> Hi,
>>>
>>> On Fri, May 22, 2015 at 07:29:15PM +0800, Lu Baolu wrote:
>>>> Phy drivers and the ulpi interface providers depend on the
>>>> registeration of the ulpi bus.  Ulpi registers the bus in
>>>> module_init(). This could result in a load order issue, i.e.
>>> It's still not an issue :(
>>> I'd say "unnecessary probe delays".
>> I managed to boot a kernel built from the top of Felipe's
>> remotes/origin/next branch under an Ubuntu environment
>> on Intel's Bay Trail tablet.
>>
>> The same panic (as I found in the Android environment previously)
>> shows up as well. And if I replace module_init() with sys_initcall(),
>> the panic disappears.
> the problem is something else... Moving things around in the init levels
> is just a workaround for another issue. Seems like there's some missing
> EPROBE_DEFER somewhere.

Yes, I agree.

Heikki, I assume "missing EPROBE_DEFER issue" will be fixed by
Sasha's patch. I will resend the patch with a new commit
message.

Thanks,
Baolu

>

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