linux-kernel - Re: [PATCH 03/13] driver_find_device: Unify the match function with class_find

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Date:   Wed, 12 Jun 2019 10:32:46 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        rafael@...nel.org, Corey Minyard <minyard@....org>,
        Russell King <linux@...linux.org.uk>,
        Thierry Reding <thierry.reding@...il.com>,
        Will Deacon <will.deacon@....com>,
        Joerg Roedel <joro@...tes.org>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Sebastian Ott <sebott@...ux.ibm.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Nehal Shah <nehal-bakulchandra.shah@....com>,
        Shyam Sundar S K <shyam-sundar.s-k@....com>,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: Re: [PATCH 03/13] driver_find_device: Unify the match function with
 class_find_device()

On Wed, 05 Jun 2019, Suzuki K Poulose wrote:

> The driver_find_device() accepts a match function pointer to
> filter the devices for lookup, similar to bus/class_find_device().
> However, there is a minor difference in the prototype for the
> match parameter for driver_find_device() with the now unified
> version accepted by {bus/class}_find_device(), where it doesn't
> accept a "const" qualifier for the data argument. This prevents
> us from reusing the generic match functions for driver_find_device().
> 
> For this reason, change the prototype of the driver_find_device() to
> make the "match" parameter in line with {bus/class}_find_device()
> and adjust its callers to use the const qualifier. Also, we could
> now promote the "data" parameter to const as we pass it down
> as a const parameter to the match functions.
> 
> Cc: Corey Minyard <minyard@....org>
> Cc: Russell King <linux@...linux.org.uk>
> Cc: Thierry Reding <thierry.reding@...il.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Joerg Roedel <joro@...tes.org>
> Cc: Peter Oberparleiter <oberpar@...ux.ibm.com>
> Cc: Sebastian Ott <sebott@...ux.ibm.com>
> Cc: David Airlie <airlied@...ux.ie>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: Nehal Shah <nehal-bakulchandra.shah@....com>
> Cc: Shyam Sundar S K <shyam-sundar.s-k@....com>
> Cc: Lee Jones <lee.jones@...aro.org>
> Cc: Christian Borntraeger <borntraeger@...ibm.com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  drivers/amba/tegra-ahb.c             | 4 ++--
>  drivers/base/driver.c                | 4 ++--
>  drivers/char/ipmi/ipmi_msghandler.c  | 8 ++++----
>  drivers/gpu/drm/tegra/dc.c           | 4 ++--
>  drivers/i2c/busses/i2c-amd-mp2-pci.c | 2 +-
>  drivers/iommu/arm-smmu-v3.c          | 2 +-
>  drivers/iommu/arm-smmu.c             | 2 +-

>  drivers/mfd/altera-sysmgr.c          | 4 ++--
>  drivers/mfd/syscon.c                 | 2 +-

I'm okay with the changes.  How do you plan on managing the merge?

>  drivers/s390/cio/ccwgroup.c          | 2 +-
>  drivers/s390/cio/chsc_sch.c          | 2 +-
>  drivers/s390/cio/device.c            | 2 +-
>  include/linux/device.h               | 4 ++--
>  13 files changed, 21 insertions(+), 21 deletions(-)

[...]

> diff --git a/drivers/mfd/altera-sysmgr.c b/drivers/mfd/altera-sysmgr.c
> index 8976f82..2ee14d8 100644
> --- a/drivers/mfd/altera-sysmgr.c
> +++ b/drivers/mfd/altera-sysmgr.c
> @@ -92,9 +92,9 @@ static struct regmap_config altr_sysmgr_regmap_cfg = {
>   * Matching function used by driver_find_device().
>   * Return: True if match is found, otherwise false.
>   */
> -static int sysmgr_match_phandle(struct device *dev, void *data)
> +static int sysmgr_match_phandle(struct device *dev, const void *data)
>  {
> -	return dev->of_node == (struct device_node *)data;
> +	return dev->of_node == (const struct device_node *)data;
>  }
>  
>  /**
> diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
> index 8ce1e41..4f39ba5 100644
> --- a/drivers/mfd/syscon.c
> +++ b/drivers/mfd/syscon.c
> @@ -190,7 +190,7 @@ struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
>  }
>  EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);
>  
> -static int syscon_match_pdevname(struct device *dev, void *data)
> +static int syscon_match_pdevname(struct device *dev, const void *data)
>  {
>  	return !strcmp(dev_name(dev), (const char *)data);
>  }

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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