[PATCH -next v2] hwmon: (smpro-hwmon) Improve switch statments in smpro_is_visible()

[PATCH -next v2] hwmon: (smpro-hwmon) Improve switch statments in smpro_is_visible()

[Nathan Chancellor]

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>
---

v2:

    * Add missing default case to inner switch statement (Guenter)
    * Fix indentation of break in inner switch statement (Guenter)
    * Reword commit message to include these changes

v1: https://lore.kernel.org/20221027195238.1789586-1-nathan@kernel.org/

 drivers/hwmon/smpro-hwmon.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/smpro-hwmon.c b/drivers/hwmon/smpro-hwmon.c
index ee54e21c2c12..a76c49dd8438 100644
--- 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;
 	}

base-commit: 0ffb687b6508c36a17b99bdaf014b38532404182
-- 
2.38.1

Re: [PATCH -next v2] hwmon: (smpro-hwmon) Improve switch statments in smpro_is_visible()

[Guenter Roeck]

On Thu, Oct 27, 2022 at 04:16:12PM -0700, Nathan Chancellor wrote:
> 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>

Applied.

Thanks,
Guenter

> ---
> 
> v2:
> 
>     * Add missing default case to inner switch statement (Guenter)
>     * Fix indentation of break in inner switch statement (Guenter)
>     * Reword commit message to include these changes
> 
> v1: https://lore.kernel.org/20221027195238.1789586-1-nathan@kernel.org/
> 
>  drivers/hwmon/smpro-hwmon.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> 
> base-commit: 0ffb687b6508c36a17b99bdaf014b38532404182
> 
> diff --git a/drivers/hwmon/smpro-hwmon.c b/drivers/hwmon/smpro-hwmon.c
> index ee54e21c2c12..a76c49dd8438 100644
> --- 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;
>  	}

Re: [PATCH -next v2] hwmon: (smpro-hwmon) Improve switch statments in smpro_is_visible()

[Quan Nguyen]

Thanks Nathan for the fix.
- Quan

On 29/10/2022 01:14, Guenter Roeck wrote:
> On Thu, Oct 27, 2022 at 04:16:12PM -0700, Nathan Chancellor wrote:
>> 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>
> 
> Applied.
> 
> Thanks,
> Guenter
> 
>> ---
>>
>> v2:
>>
>>      * Add missing default case to inner switch statement (Guenter)
>>      * Fix indentation of break in inner switch statement (Guenter)
>>      * Reword commit message to include these changes
>>
>> v1: https://lore.kernel.org/20221027195238.1789586-1-nathan@kernel.org/
>>
>>   drivers/hwmon/smpro-hwmon.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>>
>> base-commit: 0ffb687b6508c36a17b99bdaf014b38532404182
>>
>> diff --git a/drivers/hwmon/smpro-hwmon.c b/drivers/hwmon/smpro-hwmon.c
>> index ee54e21c2c12..a76c49dd8438 100644
>> --- 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;
>>   	}