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SubjectRe: [PATCH] can: mark expected switch fall-throughs
Date
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>

> 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) {
>


--
Nicolas Ferre
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