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Subject: Re: [PATCH] can: mark expected switch fall-throughs
To:     Nicolas.Ferre@microchip.com, wg@grandegger.com, mkl@pengutronix.de,
        davem@davemloft.net, alexandre.belloni@bootlin.com,
        Ludovic.Desroches@microchip.com
Cc:     linux-can@vger.kernel.org, netdev@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
References: <20190129180612.GA28650@embeddedor>
 <432a9399-95f4-e988-5cd2-93340f155fa1@microchip.com>
From:   "Gustavo A. R. Silva" <gustavo@embeddedor.com>
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Message-ID: <daae008e-35fd-7553-fcb2-7932fe53b959@embeddedor.com>
Date:   Thu, 14 Feb 2019 15:37:26 -0600
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On 1/30/19 2:11 AM, Nicolas.Ferre@microchip.com wrote:
> On 29/01/2019 at 19:06, Gustavo A. R. Silva wrote:
>> In preparation to enabling -Wimplicit-fallthrough, mark switch cases
>> where we are expecting to fall through.
>>
>> This patch fixes the following warnings:
>>
>> drivers/net/can/peak_canfd/peak_pciefd_main.c:668:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
>> drivers/net/can/spi/mcp251x.c:875:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
>> drivers/net/can/usb/peak_usb/pcan_usb.c:422:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
>> drivers/net/can/at91_can.c:895:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
>> drivers/net/can/at91_can.c:953:15: warning: this statement may fall through [-Wimplicit-fallthrough=]
>> drivers/net/can/usb/peak_usb/pcan_usb.c: In function ‘pcan_usb_decode_error’:
>> drivers/net/can/usb/peak_usb/pcan_usb.c:422:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
>>     if (n & PCAN_USB_ERROR_BUS_LIGHT) {
>>        ^
>> drivers/net/can/usb/peak_usb/pcan_usb.c:428:2: note: here
>>    case CAN_STATE_ERROR_WARNING:
>>    ^~~~
>>
>> Warning level 3 was used: -Wimplicit-fallthrough=3
>>
>> This patch is part of the ongoing efforts to enabling
>> -Wimplicit-fallthrough.
>>
>> Notice that in some cases spelling mistakes were fixed.
>> In other cases, the /* fall through */ comment is placed
>> at the bottom of the case statement, which is what GCC
>> is expecting to find.
>>
>> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
>> ---
>>   drivers/net/can/at91_can.c                    | 6 ++++--
> 
> For this one:
> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
> 

Thanks, Nicolas.

Dave:

I wonder if you can take this patch.

Thanks
--
Gustavo

>>   drivers/net/can/peak_canfd/peak_pciefd_main.c | 2 +-
>>   drivers/net/can/spi/mcp251x.c                 | 3 ++-
>>   drivers/net/can/usb/peak_usb/pcan_usb.c       | 2 +-
>>   4 files changed, 8 insertions(+), 5 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;
>> diff --git a/drivers/net/can/peak_canfd/peak_pciefd_main.c b/drivers/net/can/peak_canfd/peak_pciefd_main.c
>> index c458d5fdc8d3..e4f4d65a76b4 100644
>> --- a/drivers/net/can/peak_canfd/peak_pciefd_main.c
>> +++ b/drivers/net/can/peak_canfd/peak_pciefd_main.c
>> @@ -668,7 +668,7 @@ static int pciefd_can_probe(struct pciefd_board *pciefd)
>>   		pciefd_can_writereg(priv, CANFD_CLK_SEL_80MHZ,
>>   				    PCIEFD_REG_CAN_CLK_SEL);
>>   
>> -		/* fallthough */
>> +		/* fall through */
>>   	case CANFD_CLK_SEL_80MHZ:
>>   		priv->ucan.can.clock.freq = 80 * 1000 * 1000;
>>   		break;
>> diff --git a/drivers/net/can/spi/mcp251x.c b/drivers/net/can/spi/mcp251x.c
>> index e90817608645..17257c73c302 100644
>> --- a/drivers/net/can/spi/mcp251x.c
>> +++ b/drivers/net/can/spi/mcp251x.c
>> @@ -875,7 +875,8 @@ static irqreturn_t mcp251x_can_ist(int irq, void *dev_id)
>>   			if (new_state >= CAN_STATE_ERROR_WARNING &&
>>   			    new_state <= CAN_STATE_BUS_OFF)
>>   				priv->can.can_stats.error_warning++;
>> -		case CAN_STATE_ERROR_WARNING:	/* fallthrough */
>> +			/* fall through */
>> +		case CAN_STATE_ERROR_WARNING:
>>   			if (new_state >= CAN_STATE_ERROR_PASSIVE &&
>>   			    new_state <= CAN_STATE_BUS_OFF)
>>   				priv->can.can_stats.error_passive++;
>> diff --git a/drivers/net/can/usb/peak_usb/pcan_usb.c b/drivers/net/can/usb/peak_usb/pcan_usb.c
>> index 13238a72a338..eca785532b6b 100644
>> --- a/drivers/net/can/usb/peak_usb/pcan_usb.c
>> +++ b/drivers/net/can/usb/peak_usb/pcan_usb.c
>> @@ -423,7 +423,7 @@ static int pcan_usb_decode_error(struct pcan_usb_msg_context *mc, u8 n,
>>   			new_state = CAN_STATE_ERROR_WARNING;
>>   			break;
>>   		}
>> -		/* else: fall through */
>> +		/* fall through */
>>   
>>   	case CAN_STATE_ERROR_WARNING:
>>   		if (n & PCAN_USB_ERROR_BUS_HEAVY) {
>>
> 
>