linux-kernel - Re: [PATCH v2 2/5] powerpc: pseries: vio: match parent nodes with of_find_node_by

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Date:   Fri, 25 Aug 2017 10:10:30 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Rob Herring <robh@...nel.org>
Cc:     "devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        David Laight <David.Laight@...lab.com>
Subject: Re: [PATCH v2 2/5] powerpc: pseries: vio: match parent nodes with of_find_node_by_path

Rob Herring <robh@...nel.org> writes:

> On Tue, Aug 22, 2017 at 12:12 AM, Michael Ellerman <mpe@...erman.id.au> wrote:
>> Rob Herring <robh@...nel.org> writes:
>>
>>> In preparation to remove the full path from device_node.full_name, use
>>> of_find_node_by_path instead of open coding with strcmp.
>>>
>>> Signed-off-by: Rob Herring <robh@...nel.org>
>>> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>>> Cc: Paul Mackerras <paulus@...ba.org>
>>> Cc: Michael Ellerman <mpe@...erman.id.au>
>>> Cc: linuxppc-dev@...ts.ozlabs.org
>>> ---
>>> v2:
>>> - rebased to linux-next and removed spurious change fro patch 1.
>>>
>>>  arch/powerpc/platforms/pseries/vio.c | 4 ++--
>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c
>>> index aa5ca74316fa..5754572deb23 100644
>>> --- a/arch/powerpc/platforms/pseries/vio.c
>>> +++ b/arch/powerpc/platforms/pseries/vio.c
>>> @@ -1357,9 +1357,9 @@ struct vio_dev *vio_register_device_node(struct device_node *of_node)
>>>        */
>>>       parent_node = of_get_parent(of_node);
>>>       if (parent_node) {
>>> -             if (!strcmp(parent_node->full_name, "/ibm,platform-facilities"))
>>> +             if (parent_node == of_find_node_by_path("/ibm,platform-facilities"))
>>>                       family = PFO;
>>> -             else if (!strcmp(parent_node->full_name, "/vdevice"))
>>> +             else if (parent_node == of_find_node_by_path("/vdevice"))
>>>                       family = VDEVICE;
>>
>> This leaks references to the looked up nodes.
>>
>> Both these nodes are defined in PAPR (our hypervisor spec), and both of
>> them must have a device_type, either "ibm,platform-facilities" or
>> "vdevice".
>>
>> Looking at the commit that added the code I don't see any particular
>> reason it used the comparison against full_name, rather than using the
>> device_type.
>>
>> So I'm inclined to do this instead:
>>
>> diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c
>> index 8a47f168476b..f26f906e6021 100644
>> --- a/arch/powerpc/platforms/pseries/vio.c
>> +++ b/arch/powerpc/platforms/pseries/vio.c
>> @@ -1357,9 +1357,9 @@ struct vio_dev *vio_register_device_node(struct device_node *of_node)
>>          */
>>         parent_node = of_get_parent(of_node);
>>         if (parent_node) {
>> -               if (!strcmp(parent_node->full_name, "/ibm,platform-facilities"))
>> +               if (!strcmp(parent_node->type, "ibm,platform-facilities"))
>>                         family = PFO;
>> -               else if (!strcmp(parent_node->full_name, "/vdevice"))
>> +               else if (!strcmp(parent_node->type, "vdevice"))
>>                         family = VDEVICE;
>>                 else {
>>                         pr_warn("%s: parent(%s) of %s not recognized.\n",
>>
>>
>> I've checked both Qemu and kvmtool add the device_type, and I'm fairly
>> confident that PowerVM does too. Anyway I'll test it on all the machines
>> I can find.
>
> Okay, do you want me to respin the patch or will you update it with

I merged it. Should be in next today.

cheers