[PATCHv3 1/7] EDAC, altera: Check parent status for Arria10 EDAC block

[tthayer@opensource.altera.com (Thor Thayer)]

On 06/17/2016 11:46 AM, Borislav Petkov wrote:
> On Mon, Jun 13, 2016 at 04:19:06PM -0500, tthayer at opensource.altera.com wrote:
>> From: Thor Thayer <tthayer@opensource.altera.com>
>>
>> In preparation for the Arria10 ECC modules, check the status
>> of the parent in the device tree to ensure the block is enabled.
>> Skip if no parent phandle is set in the device tree.
>>
>> Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
>> ---
>> v2  No change
>> v3  Move check into validate_parent_available().
>> ---
>>   drivers/edac/altera_edac.c |   17 +++++++++++++++++
>>   1 file changed, 17 insertions(+)
>>
>> diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
>> index 6f5d586..926bcaf 100644
>> --- a/drivers/edac/altera_edac.c
>> +++ b/drivers/edac/altera_edac.c
>> @@ -1125,6 +1125,20 @@ static void altr_edac_a10_irq_handler(struct irq_desc *desc)
>>   	chained_irq_exit(chip, desc);
>>   }
>>
>> +static int validate_parent_available(struct device_node *np)
>> +{
>> +	struct device_node *parent;
>> +
>> +	/* Ensure parent device is enabled if parent node exists */
>> +	parent = of_parse_phandle(np, "parent", 0);
>> +	if (parent && !of_device_is_available(parent)) {
>> +		of_node_put(parent);
>> +		return -ENODEV;
>> +	}
>> +	of_node_put(parent);
>> +	return 0;
>> +}
>
> How about this - it is a bit simpler:
>
> static int validate_parent_available(struct device_node *np)
> {
>          struct device_node *parent;
>          int ret = 0;
>
>          /* Ensure parent device is enabled if parent node exists */
>          parent = of_parse_phandle(np, "parent", 0);
>          if (parent && !of_device_is_available(parent))
>                  ret = -ENODEV;
>
>          of_node_put(parent);
>          return ret;
> }
>
> ?
>
Yes. Thanks! I will make the change.