linux-kernel - Re: [PATCH v4 01/18] fpga: bridge: support getting bridge from device

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Date:   Thu, 14 Sep 2017 15:29:09 -0700 (PDT)
From:   matthew.gerlach@...ux.intel.com
To:     Alan Tull <atull@...nel.org>
cc:     Moritz Fischer <mdf@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-fpga@...r.kernel.org
Subject: Re: [PATCH v4 01/18] fpga: bridge: support getting bridge from
 device



On Thu, 14 Sep 2017, Alan Tull wrote:

> On Wed, Sep 13, 2017 at 6:38 PM,  <matthew.gerlach@...ux.intel.com> wrote:
>
> Hi Matthew,
>
>>
>> Hi Alan,
>>
>> Two minor nits below.
>>
>> Matthew Gerlach
>>
>> On Wed, 13 Sep 2017, Alan Tull wrote:
>>
>>> Add two functions for getting the FPGA bridge from the device
>>> rather than device tree node.  This is to enable writing code
>>> that will support using FPGA bridges without device tree.
>>> Rename one old function to make it clear that it is device
>>> tree-ish.  This leaves us with 3 functions for getting a bridge:
>>>
>>> * fpga_bridge_get
>>>  Get the bridge given the device.
>>>
>>> * fpga_bridges_get_to_list
>>>  Given the device, get the bridge and add it to a list.
>>>
>>> * of_fpga_bridges_get_to_list
>>>  Renamed from priviously existing fpga_bridges_get_to_list.
>>>  Given the device node, get the bridge and add it to a list.
>>>
>>> Signed-off-by: Alan Tull <atull@...nel.org>
>>> ---
>>> v2: use list_for_each_entry
>>>    static the bridge_list_lock
>>>    update copyright and author email
>>> v3: no change to this patch in this version of patchset
>>> v4: no change to this patch in this version of patchset
>>> ---
>>> drivers/fpga/fpga-bridge.c       | 110
>>> +++++++++++++++++++++++++++++++--------
>>> drivers/fpga/fpga-region.c       |  11 ++--
>>> include/linux/fpga/fpga-bridge.h |   7 ++-
>>> 3 files changed, 100 insertions(+), 28 deletions(-)
>>>
>>> diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c
>>> index fcd2bd3..af6d97e 100644
>>> --- a/drivers/fpga/fpga-bridge.c
>>> +++ b/drivers/fpga/fpga-bridge.c
>>> @@ -2,6 +2,7 @@
>>>  * FPGA Bridge Framework Driver
>>>  *
>>>  *  Copyright (C) 2013-2016 Altera Corporation, All Rights Reserved.
>>> + *  Copyright (C) 2017 Intel Corporation
>>>  *
>>>  * This program is free software; you can redistribute it and/or modify it
>>>  * under the terms and conditions of the GNU General Public License,
>>> @@ -70,29 +71,12 @@ int fpga_bridge_disable(struct fpga_bridge *bridge)
>>> }
>>> EXPORT_SYMBOL_GPL(fpga_bridge_disable);
>>>
>>> -/**
>>> - * of_fpga_bridge_get - get an exclusive reference to a fpga bridge
>>> - *
>>> - * @np: node pointer of a FPGA bridge
>>> - * @info: fpga image specific information
>>> - *
>>> - * Return fpga_bridge struct if successful.
>>> - * Return -EBUSY if someone already has a reference to the bridge.
>>> - * Return -ENODEV if @np is not a FPGA Bridge.
>>> - */
>>> -struct fpga_bridge *of_fpga_bridge_get(struct device_node *np,
>>> -                                      struct fpga_image_info *info)
>>> -
>>> +struct fpga_bridge *__fpga_bridge_get(struct device *dev,
>>> +                                     struct fpga_image_info *info)
>>
>>
>> Should this be a static function?
>
> You are right.  Will fix in v5.
>
>>
>> I was recently told by mtd maintainers that function names prefixed with
>> __ should be avoided.
>
> I see functions named thusly around in the kernel.   Can you point me
> to that thread or let me know what their thinking was about this?  I
> am open for suggestions for a new function name.

Marek Vasut just told me to "Avoid function names with __ prefix" in

https://patchwork.kernel.org/patch/9883977/

I tend to agree with you that the __ prefix seems to be around, but
this could be a case of "evolution" of coding style.  Historically,
__ seems to mean an internal version of an external function.  If __
is to be avoided, we might have to rename to fpga_bridge_get_internal().

>
> Alan
> --
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