Re: [PATCH] can: m_can: fix boolreturn.cocci warnings

[Jeroen Hofstee]

Hi,

On 10/15/19 7:57 AM, Simon Horman wrote:
> On Mon, Oct 14, 2019 at 11:04:28PM +0800, kbuild test robot wrote:
>> From: kbuild test robot <lkp@xxxxxxxxx>
>>
>> drivers/net/can/m_can/m_can.c:783:9-10: WARNING: return of 0/1 in function 'is_protocol_err' with return type bool
>>
>>   Return statements in functions returning bool should use
>>   true/false instead of 1/0.
>> Generated by: scripts/coccinelle/misc/boolreturn.cocci
>>
>> Fixes: 46946163ac61 ("can: m_can: add support for handling arbitration error")
>> CC: Pankaj Sharma <pankj.sharma@xxxxxxxxxxx>
>> Signed-off-by: kbuild test robot <lkp@xxxxxxxxx>
>> ---
>>
>> url:    https://github.com/0day-ci/linux/commits/Pankaj-Sharma/can-m_can-add-support-for-handling-arbitration-error/20191014-193532
>>
>>   m_can.c |    4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> --- a/drivers/net/can/m_can/m_can.c
>> +++ b/drivers/net/can/m_can/m_can.c
>> @@ -780,9 +780,9 @@ static inline bool is_lec_err(u32 psr)
>>   static inline bool is_protocol_err(u32 irqstatus)
>>   {
>>   	if (irqstatus & IR_ERR_LEC_31X)
>> -		return 1;
>> +		return true;
>>   	else
>> -		return 0;
>> +		return false;
>>   }
>>   
>>   static int m_can_handle_protocol_error(struct net_device *dev, u32 irqstatus)
>>
> <2c>
> Perhaps the following is a nicer way to express this (completely untested):
>
> 	return !!(irqstatus & IR_ERR_LEC_31X);
> </2c>


Really...., !! for bool / _Bool types? why not simply:

static inline bool is_protocol_err(u32 irqstatus)
	return irqstatus & IR_ERR_LEC_31X;
}

Regards,
Jeroen