linux-kernel - Re: [PATCH] drivers/base/node: Handle error properly in register_one

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Message-ID: <83012fcc-36ca-41fe-8e2e-949f1ba8adf3@linux.ibm.com>
Date: Wed, 2 Jul 2025 18:29:56 +0530
From: Donet Tom <donettom@...ux.ibm.com>
To: Oscar Salvador <osalvador@...e.de>
Cc: David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>, Zi Yan <ziy@...dia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ritesh Harjani <ritesh.list@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, "Rafael J . Wysocki" <rafael@...nel.org>,
        Danilo Krummrich <dakr@...nel.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Yury Norov <yury.norov@...il.com>, Dave Jiang <dave.jiang@...el.com>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH] drivers/base/node: Handle error properly in
 register_one_node()


On 7/2/25 6:16 PM, Oscar Salvador wrote:
> On Wed, Jul 02, 2025 at 06:28:56AM -0500, Donet Tom wrote:
>> If register_node() returns an error, it is not handled correctly.
>> The function will proceed further and try to register CPUs under the
>> node, which is not correct.
>>
>> So, in this patch, if register_node() returns an error, we return
>> immediately from the function.
>>
>> Signed-off-by: Donet Tom <donettom@...ux.ibm.com>
>> ---
>>
> ...
>> diff --git a/drivers/base/node.c b/drivers/base/node.c
>> index bef84f01712f..aec991b4c0b2 100644
>> --- a/drivers/base/node.c
>> +++ b/drivers/base/node.c
>> @@ -885,6 +885,8 @@ int register_one_node(int nid)
>>   	node_devices[nid] = node;
>>   
>>   	error = register_node(node_devices[nid], nid);
>> +	if (error)
>> +		return error;
> Ok, all current callers (based on mm-unstable) panic or BUG() if this fails,
> but powerpc, in init_phb_dynamic(), which keeps on going.
> Unless it panics somewhere down the road as well.
>
> So I think we need to:
>
>   node_devices[nid] = NULL
>   kfree(node)
>
>   ?


Yes, I will add this too.

But one question: if register_node() fails, is it okay to continue, or 
should we panic?

What is the correct way to handle this?


> Also, once Hannes fix lands, we might need that as well.
>
> Anyway, I'd suggest you hold on until Hannes fix lands, so we can later
> rebase all your mem-hotplug on top of that [1].

Sure


>
> [1] https://lore.kernel.org/linux-mm/86f89a65-f0f6-4462-9eea-ac691de2f3b6@suse.de/T/#mbf392eb390b8053f96be50da3b40dfd9b62dd389
>
>