linux-kernel - Re: [PATCH][next] can: at91_can: mark expected switch fall-throughs

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Date:   Mon, 11 Feb 2019 09:03:13 +0000
From:   <Nicolas.Ferre@...rochip.com>
To:     <gustavo@...eddedor.com>, <wg@...ndegger.com>,
        <mkl@...gutronix.de>, <davem@...emloft.net>,
        <alexandre.belloni@...tlin.com>, <Ludovic.Desroches@...rochip.com>
CC:     <linux-can@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] can: at91_can: mark expected switch fall-throughs

On 08/02/2019 at 19:44, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wimplicit-fallthrough, mark switch
> cases where we are expecting to fall through.
> 
> Notice that, in this particular case, the /* fall through */
> comments are placed at the bottom of the case statement, which
> is what GCC is expecting to find.
> 
> Warning level 3 was used: -Wimplicit-fallthrough=3
> 
> This patch is part of the ongoing efforts to enabling
> -Wimplicit-fallthrough.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Looks good to me:
Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>

> ---
>   drivers/net/can/at91_can.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
> index d98c69045b17..1718c20f9c99 100644
> --- a/drivers/net/can/at91_can.c
> +++ b/drivers/net/can/at91_can.c
> @@ -902,7 +902,8 @@ static void at91_irq_err_state(struct net_device *dev,
>   				CAN_ERR_CRTL_TX_WARNING :
>   				CAN_ERR_CRTL_RX_WARNING;
>   		}
> -	case CAN_STATE_ERROR_WARNING:	/* fallthrough */
> +		/* fall through */
> +	case CAN_STATE_ERROR_WARNING:
>   		/*
>   		 * from: ERROR_ACTIVE, ERROR_WARNING
>   		 * to  : ERROR_PASSIVE, BUS_OFF
> @@ -951,7 +952,8 @@ static void at91_irq_err_state(struct net_device *dev,
>   		netdev_dbg(dev, "Error Active\n");
>   		cf->can_id |= CAN_ERR_PROT;
>   		cf->data[2] = CAN_ERR_PROT_ACTIVE;
> -	case CAN_STATE_ERROR_WARNING:	/* fallthrough */
> +		/* fall through */
> +	case CAN_STATE_ERROR_WARNING:
>   		reg_idr = AT91_IRQ_ERRA | AT91_IRQ_WARN | AT91_IRQ_BOFF;
>   		reg_ier = AT91_IRQ_ERRP;
>   		break;
> 


-- 
Nicolas Ferre