On 01/20/2015 03:46 PM, Stephane Grosjean wrote:
> 
> Le 20/01/2015 15:19, Marc Kleine-Budde a écrit :
>> On 01/19/2015 05:15 PM, Stephane Grosjean wrote:
>>> Add the definition of a new callback that enable any PEAK-System CAN USB
>>> adapter to grant read access to its Bus Error Counters value.
>>> This ability is not supported by all the PEAK-System adapters, thus,
>>> for those, the callback pointer will be initiaized to NULL, which is
>>> correct regarding the linux-can device driver specs.
>>>
>>> Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
>>> ---
>>>   drivers/net/can/usb/peak_usb/pcan_usb_core.c | 2 ++
>>>   drivers/net/can/usb/peak_usb/pcan_usb_core.h | 2 ++
>>>   2 files changed, 4 insertions(+)
>>>
>>> diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.c b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
>>> index c23609a..7a73060 100644
>>> --- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c
>>> +++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
>>> @@ -794,6 +794,8 @@ static int peak_usb_create_dev(struct peak_usb_adapter *peak_usb_adapter,
>>>   	dev->can.data_bittiming_const = &peak_usb_adapter->data_bittiming_const;
>>>   	dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming;
>>>   	dev->can.do_set_mode = peak_usb_set_mode;
>>> +	dev->can.do_get_berr_counter =
>>> +		peak_usb_adapter->candev_get_berr_counter;
>>>   	dev->can.ctrlmode_supported = peak_usb_adapter->ctrlmode_supported;
>>>   
>>>   	netdev->netdev_ops = &peak_usb_netdev_ops;
>>> diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.h b/drivers/net/can/usb/peak_usb/pcan_usb_core.h
>>> index a58d971..fb402d2 100644
>>> --- a/drivers/net/can/usb/peak_usb/pcan_usb_core.h
>>> +++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.h
>>> @@ -70,6 +70,8 @@ struct peak_usb_adapter {
>>>   	int (*dev_stop)(struct peak_usb_device *dev);
>>>   	int (*dev_restart_async)(struct peak_usb_device *dev, struct urb *urb,
>>>   					u8 *buf);
>>> +	int (*candev_get_berr_counter)(const struct net_device *netdev,
>>                ^^^^^^
>>
>> I think this prefix can be removed. I've done so in my series.
> 
> FYI: I added this specific prefix because this is the only callback I'm 
> obliged to use with the "struct net_device *" argument.
> No other way to setup a specific callback to get the BEC.

IC, however the compiler will warn you, if you use the wrong arguments.

Marc

-- 
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