hwmon: (smpro-hwmon) Improve switch statments in smpro_is_visible()

Clang warns:

  drivers/hwmon/smpro-hwmon.c:378:2: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
          default:
          ^
  drivers/hwmon/smpro-hwmon.c:378:2: note: insert 'break;' to avoid fall-through
          default:
          ^
          break;
  1 error generated.

Clang is a little more pedantic than GCC, which does not warn when
falling through to a case that is just break or return. Clang's version
is more in line with the kernel's own stance in deprecated.rst, which
states that all switch/case blocks must end in either break,
fallthrough, continue, goto, or return.

Add the missing break to silence the warning. Additionally, adjust the
indentation of a break and add a default case to the inner switch
statement.

Fixes: a87456864cbb ("hwmon: Add Ampere's Altra smpro-hwmon driver")
Link: https://github.com/ClangBuiltLinux/linux/issues/1751
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20221027231611.3824800-1-nathan@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/smpro-hwmon.c b/drivers/hwmon/smpro-hwmon.c
index ee54e21c2c123f7f126fd2d5100d6db35310c747..a76c49dd8438dc1b7e809def74f563925b23b0eb 100644 (file)
--- a/drivers/hwmon/smpro-hwmon.c
+++ b/drivers/hwmon/smpro-hwmon.c
@@ -373,8 +373,11 @@ static umode_t smpro_is_visible(const void *data, enum hwmon_sensor_types type,
                        ret = regmap_read(hwmon->regmap, temperature[channel].reg, &value);
                        if (ret || value == 0xFFFF)
                                return 0;
-               break;
+                       break;
+               default:
+                       break;
                }
+               break;
        default:
                break;
        }