linux-kernel - Re: [PATCH] drivers/base: error handling fixes

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Message-ID: <4524E983.6010208@garzik.org>
Date:	Thu, 05 Oct 2006 07:16:19 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
CC:	Cornelia Huck <cornelia.huck@...ibm.com>, Greg KH <greg@...ah.com>,
	Andrew Morton <akpm@...l.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ashok Raj <ashok.raj@...el.com>,
	Nathan Lynch <nathanl@...tin.ibm.com>
Subject: Re: [PATCH] drivers/base: error handling fixes

Heiko Carstens wrote:
> On Wed, Oct 04, 2006 at 05:24:34PM +0200, Cornelia Huck wrote:
>> On Wed, 4 Oct 2006 09:05:54 -0400,
>> Jeff Garzik <jeff@...zik.org> wrote:
>>
>>>  static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
>>> @@ -112,17 +110,18 @@ static int __cpuinit topology_cpu_callba
>>>  {
>>>  	unsigned int cpu = (unsigned long)hcpu;
>>>  	struct sys_device *sys_dev;
>>> +	int rc = 0;
>>>  
>>>  	sys_dev = get_cpu_sysdev(cpu);
>>>  	switch (action) {
>>>  	case CPU_ONLINE:
>>> -		topology_add_dev(sys_dev);
>>> +		rc = topology_add_dev(sys_dev);
>>>  		break;
>>>  	case CPU_DEAD:
>>>  		topology_remove_dev(sys_dev);
>>>  		break;
>>>  	}
>>> -	return NOTIFY_OK;
>>> +	return rc ? NOTIFY_BAD : NOTIFY_OK;
>>>  }
>> Wouldn't that also require that _cpu_up checked the return code when
>> doing CPU_ONLINE notification (and clean up on error)?
> 
> After all code that gets a CPU_ONLINE notification is not supposed to fail.
> For allocating resources while bringing up a cpu CPU_UP_PREPARE is supposed
> to be used. That one is allowed to fail.

It's a bug no matter how you look at it... I just lessen the impact.  :)

If someone wants to provide a better fix, let's see the patch...

	Jeff



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