linux-kernel - [PATCH] usb: host: ohci-tmio: Mark expected switch fall-throughs

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Date:   Mon, 29 Jul 2019 17:22:01 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH] usb: host: ohci-tmio: Mark expected switch fall-throughs

Mark switch cases where we are expecting to fall through.

This patch fixes the following warning (Building: arm):

drivers/usb/host/ohci-tmio.c: In function ‘tmio_stop_hc’:
./include/linux/device.h:1499:2: warning: this statement may fall through [-Wimplicit-fallthrough=]
  _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/usb/host/ohci-tmio.c:99:4: note: in expansion of macro ‘dev_err’
    dev_err(&dev->dev, "Unsupported amount of ports: %d\n", ohci->num_ports);
    ^~~~~~~
In file included from drivers/usb/host/ohci-hcd.c:1257:0:
drivers/usb/host/ohci-tmio.c:100:3: note: here
   case 3:
   ^~~~
drivers/usb/host/ohci-tmio.c:101:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
    pm |= CCR_PM_USBPW3;
       ^
drivers/usb/host/ohci-tmio.c:102:3: note: here
   case 2:
   ^~~~
drivers/usb/host/ohci-tmio.c:103:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
    pm |= CCR_PM_USBPW2;
       ^
drivers/usb/host/ohci-tmio.c:104:3: note: here
   case 1:
   ^~~~

Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 drivers/usb/host/ohci-tmio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/host/ohci-tmio.c b/drivers/usb/host/ohci-tmio.c
index d5a293a707b6..fb6f5e9ae5c6 100644
--- a/drivers/usb/host/ohci-tmio.c
+++ b/drivers/usb/host/ohci-tmio.c
@@ -97,10 +97,13 @@ static void tmio_stop_hc(struct platform_device *dev)
 	switch (ohci->num_ports) {
 		default:
 			dev_err(&dev->dev, "Unsupported amount of ports: %d\n", ohci->num_ports);
+			/* fall through */
 		case 3:
 			pm |= CCR_PM_USBPW3;
+			/* fall through */
 		case 2:
 			pm |= CCR_PM_USBPW2;
+			/* fall through */
 		case 1:
 			pm |= CCR_PM_USBPW1;
 	}
-- 
2.22.0