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

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Date:   Tue, 15 Oct 2019 07:57:22 +0200
From:   Simon Horman <simon.horman@...ronome.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     Pankaj Sharma <pankj.sharma@...sung.com>, kbuild-all@...ts.01.org,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, wg@...ndegger.com,
        mkl@...gutronix.de, davem@...emloft.net,
        eugen.hristev@...rochip.com, ludovic.desroches@...rochip.com,
        pankaj.dubey@...sung.com, rcsekar@...sung.com,
        Sriram Dash <sriram.dash@...sung.com>
Subject: Re: [PATCH] can: m_can: fix boolreturn.cocci warnings

On Mon, Oct 14, 2019 at 11:04:28PM +0800, kbuild test robot wrote:
> From: kbuild test robot <lkp@...el.com>
> 
> 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@...sung.com>
> Signed-off-by: kbuild test robot <lkp@...el.com>
> ---
> 
> 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>