linux-kernel - Re: [PATCH v2 4/5] firmware: generalize reading file contents as a helper

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Message-ID: <CA+5PVA4AtO8zieYQDOSjVdSYNUmrO_0MDOUh_=beszkWPozfmA@mail.gmail.com>
Date:	Fri, 9 Oct 2015 08:46:42 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Ming Lei <ming.lei@...onical.com>,
	Jonathan Corbet <corbet@....net>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	linux-doc@...r.kernel.org, David Woodhouse <dwmw2@...radead.org>,
	David Howells <dhowells@...hat.com>,
	Seth Forshee <seth.forshee@...onical.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Michal Marek <mmarek@...e.cz>,
	Matthew Garrett <mjg59@...f.ucam.org>, kyle@...nel.org,
	linux-security-module <linux-security-module@...r.kernel.org>,
	keyrings@...ux-nfs.org, Tom Gundersen <teg@...m.no>
Subject: Re: [PATCH v2 4/5] firmware: generalize reading file contents as a helper

On Thu, Oct 8, 2015 at 6:54 PM, Luis R. Rodriguez <mcgrof@...e.com> wrote:
> On Thu, Oct 08, 2015 at 01:36:53PM -0400, Josh Boyer wrote:
>> On Thu, Oct 1, 2015 at 1:44 PM, Luis R. Rodriguez
>> <mcgrof@...not-panic.com> wrote:
>> > From: David Howells <dhowells@...hat.com>
>> >
>> > We'll want to reuse this same code later in order to
>> > read two separate types of file contents. This generalizes
>> > fw_read_file() for reading a file rebrands it as fw_read_file().
>>
>> Er, maybe that should read "...fw_read_file_contents() for reading a
>> file and rebrands it as fw_read_file()." ?
>
> Thanks, corrected.
>
>> > This caller lets us pegs arbitrary data onto the target
>> > buffer and size if the file is found.
>>
>> This sentence is somewhat confusing.  The data isn't arbitrary. It is
>> what the caller wants you to read from path.  What is arbitrary, at
>> least in the context of this function, is the path passed to it.
>> Maybe rewrite this as:
>>
>> "The new function allows us to read file contents from arbitrary paths
>> and return the data and size of the files read."
>
> The path is arbitrary but what I meant by arbitrary data is that
> the data need no longer be firmware, whereas fw_read_file_contents()
> *did* require passing firmware_class data structures. What this does
> is it make the possibility of eventually making a more core system
> data file reader more obvious, so for instance the goal is to later
> share a reader with:
>
>     - firmware_class: fw_read_file()
>     - module: kernel_read()
>     - kexec: copy_file_fd()
>
> I will clarify this in the commit log and also clarify the path is
> arbitrary as well as you note.
>
>> > While at it this cleans up the exit paths on fw_read_file().
>> >
>> > Signed-off-by: David Howells <dhowells@...hat.com>
>> > Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
>>
>> The code changes themselves look fine.
>
> Thank you for the review. Can I peg your Acked-by or Reviewed-by?
> How about this for a change in the commit log:
>
> firmware: generalize reading file contents as a helper
>
> We'll want to reuse this same code later in order to read
> two separate types of file contents. This generalizes
> fw_read_file_contents() for reading a file and rebrands it
> as fw_read_file(). This new caller is now generic and that
> path can be arbitrary, the caller is also agnostic to the
> firmware_class code now, which begs the possibility of code
> re-use with other similar callers in the kernel. For instance
> in the future we may want to share a solution with:
>
>     - firmware_class: fw_read_file()
>     - module: kernel_read()
>     - kexec: copy_file_fd()
>
> While at it this also cleans up the exit paths on fw_read_file().

That reads much clearer to me.  Thanks.  With that changed:

Reviewed-by: Josh Boyer <jwboyer@...oraproject.org>

josh
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