linux-kernel - Re: [PATCH 6/6] acpi: Return -ENOENT in acpi_table

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Date:	Mon, 19 Aug 2013 13:29:39 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	lenb@...nel.org, rjw@...k.pl, liwanp@...ux.vnet.ibm.com,
	tj@...nel.org, akpm@...ux-foundation.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 6/6] acpi: Return -ENOENT in acpi_table_parse() and fix
 wrong comment.

On Fri, 2013-08-16 at 15:06 +0800, Tang Chen wrote:
> The comment about return value of acpi_table_parse() is incorrect.
> This patch fix it.
> 
> Furthermore, if the table is not found, return 1 means nothing, and
> make it difficult to write the comment. So return -ENOENT when the
> table is not found, and correct the comment.

I am OK with the change, but the above description is not very clear.
You should state that all callers only check if the function succeeded
or not.  So, you are simplifying the semantics by returning -errno for
all failure cases.

Since you are making this change, I'd suggest you also update the stub
function in linux/acpi.h to return -ENODEV as well.

Thanks,
-Toshi

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