linux-kernel - Re: [PATCH] PCI: Mark expected switch fall-throughs

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Date:   Tue, 10 Jul 2018 12:09:03 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: Mark expected switch fall-throughs

On Thu, Jul 05, 2018 at 09:56:00AM -0500, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wimplicit-fallthrough, mark switch cases
> where we are expecting to fall through.
> 
> Warning level 2 was used: -Wimplicit-fallthrough=2
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Applied to pci/misc for v4.19, thanks!

If you'd like to apply this elsewhere as part of a larger series, feel
free to do that.  Just add my ack and let me know to drop it.

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

> ---
>  drivers/pci/hotplug/pciehp_ctrl.c | 2 ++
>  drivers/pci/hotplug/shpchp_ctrl.c | 2 ++
>  drivers/pci/pci.c                 | 1 +
>  drivers/pci/quirks.c              | 1 +
>  4 files changed, 6 insertions(+)
> 
> diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
> index c684faa..cfc46e8 100644
> --- a/drivers/pci/hotplug/pciehp_ctrl.c
> +++ b/drivers/pci/hotplug/pciehp_ctrl.c
> @@ -436,6 +436,7 @@ int pciehp_sysfs_enable_slot(struct slot *p_slot)
>  	switch (p_slot->state) {
>  	case BLINKINGON_STATE:
>  		cancel_delayed_work(&p_slot->work);
> +		/* fall through */
>  	case STATIC_STATE:
>  		p_slot->state = POWERON_STATE;
>  		mutex_unlock(&p_slot->lock);
> @@ -473,6 +474,7 @@ int pciehp_sysfs_disable_slot(struct slot *p_slot)
>  	switch (p_slot->state) {
>  	case BLINKINGOFF_STATE:
>  		cancel_delayed_work(&p_slot->work);
> +		/* fall through */
>  	case STATIC_STATE:
>  		p_slot->state = POWEROFF_STATE;
>  		mutex_unlock(&p_slot->lock);
> diff --git a/drivers/pci/hotplug/shpchp_ctrl.c b/drivers/pci/hotplug/shpchp_ctrl.c
> index 1047b56..1267dcc 100644
> --- a/drivers/pci/hotplug/shpchp_ctrl.c
> +++ b/drivers/pci/hotplug/shpchp_ctrl.c
> @@ -654,6 +654,7 @@ int shpchp_sysfs_enable_slot(struct slot *p_slot)
>  	switch (p_slot->state) {
>  	case BLINKINGON_STATE:
>  		cancel_delayed_work(&p_slot->work);
> +		/* fall through */
>  	case STATIC_STATE:
>  		p_slot->state = POWERON_STATE;
>  		mutex_unlock(&p_slot->lock);
> @@ -689,6 +690,7 @@ int shpchp_sysfs_disable_slot(struct slot *p_slot)
>  	switch (p_slot->state) {
>  	case BLINKINGOFF_STATE:
>  		cancel_delayed_work(&p_slot->work);
> +		/* fall through */
>  	case STATIC_STATE:
>  		p_slot->state = POWEROFF_STATE;
>  		mutex_unlock(&p_slot->lock);
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 97acba7..f5c6ab1 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -2045,6 +2045,7 @@ static pci_power_t pci_target_state(struct pci_dev *dev, bool wakeup)
>  		case PCI_D2:
>  			if (pci_no_d1d2(dev))
>  				break;
> +			/* else: fall through */
>  		default:
>  			target_state = state;
>  		}
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index f439de8..502275c 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -2105,6 +2105,7 @@ static void quirk_netmos(struct pci_dev *dev)
>  		if (dev->subsystem_vendor == PCI_VENDOR_ID_IBM &&
>  				dev->subsystem_device == 0x0299)
>  			return;
> +		/* else: fall through */
>  	case PCI_DEVICE_ID_NETMOS_9735:
>  	case PCI_DEVICE_ID_NETMOS_9745:
>  	case PCI_DEVICE_ID_NETMOS_9845:
> -- 
> 2.7.4
>