platform/x86: thinkpad_acpi: Mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warnings:

drivers/platform/x86/thinkpad_acpi.c: In function ‘thermal_get_sensor’:
drivers/platform/x86/thinkpad_acpi.c:6316:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (idx >= 8 && idx <= 15) {
      ^
drivers/platform/x86/thinkpad_acpi.c:6322:2: note: here
  case TPACPI_THERMAL_TPEC_8:
  ^~~~
drivers/platform/x86/thinkpad_acpi.c: In function ‘hotkey_notify’:
drivers/platform/x86/thinkpad_acpi.c:4208:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
    if (tp_features.hotkey_wlsw &&
       ^
drivers/platform/x86/thinkpad_acpi.c:4216:3: note: here
   default:
   ^~~~~~~

Warning level 3 was used: -Wimplicit-fallthrough=3

Notice that, in this particular case, the code comments are modified
in accordance with what GCC is expecting to find.

This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 9192b686e9a63e2f0bd30ff4a7767d7789e4b068..4c23302e32168461b735ab0c77c3c2b41fa0d579 100644 (file)
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -4212,7 +4212,7 @@ static void hotkey_notify(struct ibm_struct *ibm, u32 event)
                                known_ev = true;
                                break;
                        }
-                       /* fallthrough to default */
+                       /* fallthrough - to default */
                default:
                        known_ev = false;
                }
@@ -6317,8 +6317,8 @@ static int thermal_get_sensor(int idx, s32 *value)
                        t = TP_EC_THERMAL_TMP8;
                        idx -= 8;
                }
-               /* fallthrough */
 #endif
+               /* fallthrough */
        case TPACPI_THERMAL_TPEC_8:
                if (idx <= 7) {
                        if (!acpi_ec_read(t + idx, &tmp))