Hi Bingbu
On 01/12/2020 03:12, Bingbu Cao wrote:
> Daniel, thanks for your patch.
>
> On 11/30/20 9:31 PM, Daniel Scally wrote:
>> Some types of fwnode_handle do not implement the device_is_available()
>> check, such as those created by software_nodes. There isn't really a
>> meaningful way to check for the availability of a device that doesn't
>> actually exist, so if the check isn't implemented just assume that the
>> "device" is present.
>>
>> Suggested-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
>> Signed-off-by: Daniel Scally <djrscally@xxxxxxxxx>
>> ---
>> Changes since RFC v3:
>>
>> patch introduced
>>
>> drivers/base/property.c | 5 +++++
>> 1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/base/property.c b/drivers/base/property.c
>> index 4c43d30145c6..a5ca2306796f 100644
>> --- a/drivers/base/property.c
>> +++ b/drivers/base/property.c
>> @@ -785,9 +785,14 @@ EXPORT_SYMBOL_GPL(fwnode_handle_put);
>> /**
>> * fwnode_device_is_available - check if a device is available for use
>> * @fwnode: Pointer to the fwnode of the device.
>> + *
>> + * For fwnode node types that don't implement the .device_is_available()
>> + * operation, this function returns true.
>> */
>> bool fwnode_device_is_available(const struct fwnode_handle *fwnode)
>> {
>> + if (!fwnode_has_op(fwnode, device_is_available))
>> + return true;
> blank line here?
Sure thing - I'll add one in
>> return fwnode_call_bool_op(fwnode, device_is_available);
>> }
>> EXPORT_SYMBOL_GPL(fwnode_device_is_available);
>>
