linux-kernel - Re: acpi : acpi_bus_trim() stops removing devices when failing to remove the device

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Date:	Thu, 11 Oct 2012 14:40:34 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Toshi Kani <toshi.kani@...com>
CC:	<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<lenb@...nel.org>, <wency@...fujitsu.com>,
	<vasilis.liaskovitis@...fitbricks.com>
Subject: Re: acpi : acpi_bus_trim() stops removing devices when failing to
 remove the device

Hi Toshi,

2012/10/10 22:01, Toshi Kani wrote:
> On Wed, 2012-10-10 at 10:07 +0900, Yasuaki Ishimatsu wrote:
>   :
>>>>    	if (acpi_drv) {
>>>>    		if (acpi_drv->ops.notify)
>>>>    			acpi_device_remove_notify_handler(acpi_dev);
>
> THIS CALL
>
>>>> -		if (acpi_drv->ops.remove)
>>>> -			acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
>>>> +		if (acpi_drv->ops.remove) {
>>>> +			ret = acpi_drv->ops.remove(acpi_dev,
>>>> +						   acpi_dev->removal_type);
>>>> +			if (ret)
>>>
>>> Hi Yasuaki,
>>>
>>> Shouldn't the notify handler be reinstalled here if it was removed by
>>> the acpi_device_remove_notify_handler() above?
>>
>> I do not reinstall the notify handler.
>> The function has not been removed on linux-3.6. And the patch is created
>> on linux-3.6. So the function remains in the patch.
>
> Umm... I am not sure what you meant.  Let me clarify my comment.  When
> acpi_drv->ops.remove() failed, I thought we would need to roll-back the
> procedure done by the acpi_device_remove_notify_handler() call, which I
> indicated as "THIS CALL" above.  So, in this error path, don't we need
> something like below?
>
> if (acpi_drv->ops.notify)
> 	acpi_device_install_notify_handler(acpi_dev)

I understood what you said.  I'll update it.

Thanks,
Yasuaki Ishimatsu

>
> Thanks,
> -Toshi
>
>
>
>


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