linux-kernel - Re: [PATCH v4 2/2] platform/x86: wmi: Avoid returning AE

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Date: Sat, 9 Mar 2024 20:10:08 +0100
From: Armin Wolf <W_Armin@....de>
To: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
 hdegoede@...hat.com, ilpo.jarvinen@...ux.intel.com
Cc: rafael@...nel.org, lenb@...nel.org, mario.limonciello@....com,
 linux-acpi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] platform/x86: wmi: Avoid returning AE_OK upon
 unknown error

Am 09.03.24 um 18:41 schrieb Kuppuswamy Sathyanarayanan:

> On 3/8/24 1:05 PM, Armin Wolf wrote:
>> If an error code other than EINVAL, ENODEV or ETIME is returned
>> by ec_read()/ec_write(), then AE_OK is wrongly returned.
>>
>> Fix this by only returning AE_OK if the return code is 0, and
>> return AE_ERROR otherwise.
>>
>> Tested on a Dell Inspiron 3505 and a Asus Prime B650-Plus.
>>
>> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
>> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
>> Signed-off-by: Armin Wolf <W_Armin@....de>
>> ---
>>   drivers/platform/x86/wmi.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
>> index d9bf6d452b3a..84d1ccf6bc14 100644
>> --- a/drivers/platform/x86/wmi.c
>> +++ b/drivers/platform/x86/wmi.c
>> @@ -1218,8 +1218,10 @@ acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address,
>>   		return AE_NOT_FOUND;
>>   	case -ETIME:
>>   		return AE_TIME;
>> -	default:
>> +	case 0:
>>   		return AE_OK;
>> +	default:
>> +		return AE_ERROR;
>>   	}
> After checking the callers of acpi_wmi_ec_space_handler() it looks like there is no benefit in returning different ACPI status per error values. It is not being used. why no just return for result < 0 AE_ERROR and return for other cases?

Hi,

those handler functions are being called in acpi_ev_address_space_dispatch(), which uses the return value to print error messages.
So it makes sense to return different ACPI error values here.

Thanks,
Armin Wolf

>>   }
>>
>> --
>> 2.39.2
>>
>>