linux-kernel - Re: [PATCH v3 04/11] driver core: Constify API device_find

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Message-ID: <7780942a-93cd-4508-be97-fc5e5267c389@icloud.com>
Date: Sun, 8 Dec 2024 21:18:54 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Uwe Kleine-König <ukleinek@...nel.org>,
 James Bottomley <James.Bottomley@...senpartnership.com>,
 Thomas Weißschuh <thomas@...ch.de>,
 linux-kernel@...r.kernel.org, nvdimm@...ts.linux.dev,
 linux-sound@...r.kernel.org, sparclinux@...r.kernel.org,
 linux-block@...r.kernel.org, linux-cxl@...r.kernel.org,
 linux1394-devel@...ts.sourceforge.net, arm-scmi@...r.kernel.org,
 linux-efi@...r.kernel.org, linux-gpio@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, linux-mediatek@...ts.infradead.org,
 linux-hwmon@...r.kernel.org, linux-media@...r.kernel.org,
 linux-pwm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
 linux-scsi@...r.kernel.org, open-iscsi@...glegroups.com,
 linux-usb@...r.kernel.org, linux-serial@...r.kernel.org,
 netdev@...r.kernel.org, Zijun Hu <quic_zijuhu@...cinc.com>
Subject: Re: [PATCH v3 04/11] driver core: Constify API device_find_child()
 then adapt for various usages

On 2024/12/6 21:52, Takashi Sakamoto wrote:
> Hi,
> 
> On Thu, Dec 05, 2024 at 08:10:13AM +0800, Zijun Hu wrote:
>> From: Zijun Hu <quic_zijuhu@...cinc.com>
>>
>> Constify the following API:
>> struct device *device_find_child(struct device *dev, void *data,
>> 		int (*match)(struct device *dev, void *data));
>> To :
>> struct device *device_find_child(struct device *dev, const void *data,
>>                                  device_match_t match);
>> typedef int (*device_match_t)(struct device *dev, const void *data);
>> with the following reasons:
>>
>> - Protect caller's match data @*data which is for comparison and lookup
>>   and the API does not actually need to modify @*data.
>>
>> - Make the API's parameters (@match)() and @data have the same type as
>>   all of other device finding APIs (bus|class|driver)_find_device().
>>
>> - All kinds of existing device match functions can be directly taken
>>   as the API's argument, they were exported by driver core.
>>
>> Constify the API and adapt for various existing usages by simply making
>> various match functions take 'const void *' as type of match data @data.
>>
>> Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
>> ---
>>  arch/sparc/kernel/vio.c                |  6 +++---
>>  drivers/base/core.c                    |  6 +++---
>>  drivers/block/sunvdc.c                 |  6 +++---
>>  drivers/bus/fsl-mc/dprc-driver.c       |  4 ++--
>>  drivers/cxl/core/pci.c                 |  4 ++--
>>  drivers/cxl/core/pmem.c                |  2 +-
>>  drivers/cxl/core/region.c              | 21 ++++++++++++---------
>>  drivers/firewire/core-device.c         |  4 ++--
>>  drivers/firmware/arm_scmi/bus.c        |  4 ++--
>>  drivers/firmware/efi/dev-path-parser.c |  4 ++--
>>  drivers/gpio/gpio-sim.c                |  2 +-
>>  drivers/gpu/drm/mediatek/mtk_drm_drv.c |  2 +-
>>  drivers/hwmon/hwmon.c                  |  2 +-
>>  drivers/media/pci/mgb4/mgb4_core.c     |  4 ++--
>>  drivers/nvdimm/bus.c                   |  2 +-
>>  drivers/pwm/core.c                     |  2 +-
>>  drivers/rpmsg/rpmsg_core.c             |  4 ++--
>>  drivers/scsi/qla4xxx/ql4_os.c          |  3 ++-
>>  drivers/scsi/scsi_transport_iscsi.c    | 10 +++++-----
>>  drivers/slimbus/core.c                 |  8 ++++----
>>  drivers/thunderbolt/retimer.c          |  2 +-
>>  drivers/thunderbolt/xdomain.c          |  2 +-
>>  drivers/tty/serial/serial_core.c       |  4 ++--
>>  drivers/usb/typec/class.c              |  8 ++++----
>>  include/linux/device.h                 |  4 ++--
>>  include/scsi/scsi_transport_iscsi.h    |  4 ++--
>>  net/dsa/dsa.c                          |  2 +-
>>  tools/testing/cxl/test/cxl.c           |  2 +-
>>  28 files changed, 66 insertions(+), 62 deletions(-)
> 
> For the changes in FireWire subsystem:
> 
> Reviewed-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
> 

thank you for code review and previous cooperation to achieve
this goal (^^).

> 
> Thanks
> 
> Takashi Sakamoto