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

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Date:	Mon, 25 May 2015 14:24:00 +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
Subject: Re: [PATCH v3 1/1] usb: ulpi: ulpi_init should be executed in subsys_initcall



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.

Thanks,
-Baolu

>
> But of cource it's Felipe's call :) Description looks better now.
>
> BR, David
>
>> ulpi phy drivers or the ulpi interface providers loading
>> before the bus registeration.
>>
>> This patch fixes this load order issue by putting ulpi_init
>> in subsys_initcall().
>>
>> Reported-by: Zhuo Qiuxu <qiuxu.zhuo@...el.com>
>> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
>> ---
>>   drivers/usb/common/ulpi.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/common/ulpi.c b/drivers/usb/common/ulpi.c
>> index 0e6f968..01c0c04 100644
>> --- a/drivers/usb/common/ulpi.c
>> +++ b/drivers/usb/common/ulpi.c
>> @@ -242,7 +242,7 @@ static int __init ulpi_init(void)
>>   {
>>   	return bus_register(&ulpi_bus);
>>   }
>> -module_init(ulpi_init);
>> +subsys_initcall(ulpi_init);
>>   
>>   static void __exit ulpi_exit(void)
>>   {
>> -- 
>> 2.1.4
>>
>

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