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SubjectRe: [PATCH v2 2/5] powerpc: pseries: vio: match parent nodes with of_find_node_by_path
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Rob Herring <robh@kernel.org> writes:

> On Tue, Aug 22, 2017 at 12:12 AM, Michael Ellerman <mpe@ellerman.id.au> wrote:
>> Rob Herring <robh@kernel.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@kernel.org>
>>> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
>>> Cc: Paul Mackerras <paulus@samba.org>
>>> Cc: Michael Ellerman <mpe@ellerman.id.au>
>>> Cc: linuxppc-dev@lists.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

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