Re: [PATCH v2] powerpc/pseries: dynamically added OF nodes need to call of_node_init

[Grant Likely <grant.likely@linaro.org>]

On Thu, Jul 10, 2014 at 1:59 PM, Nathan Fontenot
<nfont@linux.vnet.ibm.com> wrote:
> On 07/10/2014 01:50 PM, Tyrel Datwyler wrote:
>> Commit 75b57ecf9 refactored device tree nodes to use kobjects such that they
>> can be exposed via /sysfs. A secondary commit 0829f6d1f furthered this rework
>> by moving the kobect initialization logic out of of_node_add into its own
>> of_node_init function. The inital commit removed the existing kref_init calls
>> in the pseries dlpar code with the assumption kobject initialization would
>> occur in of_node_add. The second commit had the side effect of triggering a
>> BUG_ON during DLPAR, migration and suspend/resume operations as a result of
>> dynamically added nodes being uninitialized.
>>
>> This patch fixes this by adding of_node_init calls in place of the previously
>> removed kref_init calls.
>>
>> Fixes: 0829f6d1f69e ("of: device_node kobject lifecycle fixes")
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
>
> Acked-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>

Acked-by: Grant Likely <grant.likely@linaro.org>

Ben, are you going to take this or should I take it via my tree?

g.

>
>> ---
>> V2:
>>  - included stable kernel list on Cc per comment by mpe
>>
>>  arch/powerpc/platforms/pseries/dlpar.c    | 1 +
>>  arch/powerpc/platforms/pseries/reconfig.c | 1 +
>>  2 files changed, 2 insertions(+)
>>
>> diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
>> index 022b38e..2d0b4d6 100644
>> --- a/arch/powerpc/platforms/pseries/dlpar.c
>> +++ b/arch/powerpc/platforms/pseries/dlpar.c
>> @@ -86,6 +86,7 @@ static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa,
>>       }
>>
>>       of_node_set_flag(dn, OF_DYNAMIC);
>> +     of_node_init(dn);
>>
>>       return dn;
>>  }
>> diff --git a/arch/powerpc/platforms/pseries/reconfig.c b/arch/powerpc/platforms/pseries/reconfig.c
>> index 0435bb6..1c0a60d 100644
>> --- a/arch/powerpc/platforms/pseries/reconfig.c
>> +++ b/arch/powerpc/platforms/pseries/reconfig.c
>> @@ -69,6 +69,7 @@ static int pSeries_reconfig_add_node(const char *path, struct property *proplist
>>
>>       np->properties = proplist;
>>       of_node_set_flag(np, OF_DYNAMIC);
>> +     of_node_init(np);
>>
>>       np->parent = derive_parent(path);
>>       if (IS_ERR(np->parent)) {
>>
>