Re: [PATCH v3 04/11] driver core: Constify API device_find_child() then adapt for various usages

[Alison Schofield <alison.schofield@intel.com>]

On Thu, Dec 05, 2024 at 08:10:13AM +0800, Zijun Hu wrote:
> From: Zijun Hu <quic_zijuhu@quicinc.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@quicinc.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 these cxl and nvdimm pieces:

  drivers/cxl/core/pci.c                 |  4 ++--
  drivers/cxl/core/pmem.c                |  2 +-
  drivers/cxl/core/region.c              | 21 ++++++++++++---------
  drivers/nvdimm/bus.c                   |  2 +-
  tools/testing/cxl/test/cxl.c           |  2 +-

Reviewed-by: Alison Schofield <alison.schofield@intel.com>


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