linux-kernel - Re: [PATCH] acpi: Return -ENOENT in acpi_table

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Date:	Tue, 07 Jan 2014 12:50:06 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	rjw@...k.pl, lenb@...nel.org, toshi.kani@...com,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] acpi: Return -ENOENT in acpi_table_parse() and fix wrong
 comment.

On 01/06/2014 07:50 PM, Rafael J. Wysocki wrote:
> On Monday, January 06, 2014 04:47:59 PM Tang Chen wrote:
>> The comment about return value of acpi_table_parse() is incorrect.
>> This patch fix it.
>>
>> Since all callers only check if the function succeeded or not, this
>> patch simplifies the semantics by returning -errno for all failure
>> cases. This will also simply the comment.
>>
>> As suggested by Toshi Kani<toshi.kani@...com>, also change the stub
>> in linux/acpi.h to return -ENODEV.
>>
>> Signed-off-by: Tang Chen<tangchen@...fujitsu.com>
>
> Queued up for 3.14 (but please use the e-mail address from MAINTAINERS next
> time) with a modified subject.  Thanks!

OK, will use the email address from MAINTAINERS next time.

Thanks.

>
>> ---
>>   drivers/acpi/tables.c | 7 ++++---
>>   include/linux/acpi.h  | 2 +-
>>   2 files changed, 5 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
>> index 5a5263b..10022ae 100644
>> --- a/drivers/acpi/tables.c
>> +++ b/drivers/acpi/tables.c
>> @@ -278,12 +278,13 @@ acpi_table_parse_madt(enum acpi_madt_type id,
>>
>>   /**
>>    * acpi_table_parse - find table with @id, run @handler on it
>> - *
>>    * @id: table id to find
>>    * @handler: handler to run
>>    *
>>    * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
>> - * run @handler on it.  Return 0 if table found, return on if not.
>> + * run @handler on it.
>> + *
>> + * Return 0 if table found, -errno if not.
>>    */
>>   int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
>>   {
>> @@ -306,7 +307,7 @@ int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
>>   		early_acpi_os_unmap_memory(table, tbl_size);
>>   		return 0;
>>   	} else
>> -		return 1;
>> +		return -ENODEV;
>>   }
>>
>>   /*
>> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
>> index d9099b1..fecfbcd 100644
>> --- a/include/linux/acpi.h
>> +++ b/include/linux/acpi.h
>> @@ -460,7 +460,7 @@ struct acpi_table_header;
>>   static inline int acpi_table_parse(char *id,
>>   				int (*handler)(struct acpi_table_header *))
>>   {
>> -	return -1;
>> +	return -ENODEV;
>>   }
>>
>>   static inline int acpi_nvs_register(__u64 start, __u64 size)
>>
>
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