linux-kernel - Re: [PATCH 3/4] iio: adc: xilinx-ams: use device

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Message-ID: <20240803121734.25f0863b@jic23-huawei>
Date: Sat, 3 Aug 2024 12:17:34 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Javier Carrasco <javier.carrasco.cruz@...il.com>
Cc: Suzuki K Poulose <suzuki.poulose@....com>, Mike Leach
 <mike.leach@...aro.org>, James Clark <james.clark@...aro.org>, Alexander
 Shishkin <alexander.shishkin@...ux.intel.com>, Michael Hennerich
 <Michael.Hennerich@...log.com>, Lars-Peter Clausen <lars@...afoo.de>, Anand
 Ashok Dumbre <anand.ashok.dumbre@...inx.com>, Michal Simek
 <michal.simek@....com>, Sakari Ailus <sakari.ailus@...ux.intel.com>, Pavel
 Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
 coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
 linux-leds@...r.kernel.org
Subject: Re: [PATCH 3/4] iio: adc: xilinx-ams: use device_* to iterate over
 device child nodes

On Thu, 01 Aug 2024 08:13:52 +0200
Javier Carrasco <javier.carrasco.cruz@...il.com> wrote:

> Use `device_for_each_child_node_scoped()` in `ams_parse_firmware()`
> to explicitly state device child node access, and simplify the child
> node handling as it is not required outside the loop.
> 
> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
> ---
>  drivers/iio/adc/xilinx-ams.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iio/adc/xilinx-ams.c b/drivers/iio/adc/xilinx-ams.c
> index f051358d6b50..27d5e4a6f9d6 100644
> --- a/drivers/iio/adc/xilinx-ams.c
> +++ b/drivers/iio/adc/xilinx-ams.c
> @@ -1275,7 +1275,6 @@ static int ams_parse_firmware(struct iio_dev *indio_dev)
>  	struct ams *ams = iio_priv(indio_dev);
>  	struct iio_chan_spec *ams_channels, *dev_channels;
>  	struct device *dev = indio_dev->dev.parent;
> -	struct fwnode_handle *child = NULL;
>  	struct fwnode_handle *fwnode = dev_fwnode(dev);
>  	size_t ams_size;
>  	int ret, ch_cnt = 0, i, rising_off, falling_off;
> @@ -1297,13 +1296,11 @@ static int ams_parse_firmware(struct iio_dev *indio_dev)
>  		num_channels += ret;
>  	}
>  
> -	fwnode_for_each_child_node(fwnode, child) {
> +	device_for_each_child_node_scoped(dev, child) {
>  		if (fwnode_device_is_available(child)) {
This is fun.  should have been fwnode_for_each_available_child_node()
in the first place rather than iterating over all nodes, and only
doing stuff for the available ones.

Can use the device_for_each_child_node_scoped() but that only includes
available nodes anyway, so my understanding is that we can also drop
this if statement as it will always be true.


>  			ret = ams_init_module(indio_dev, child, ams_channels + num_channels);
> -			if (ret < 0) {
> -				fwnode_handle_put(child);
> +			if (ret < 0)
>  				return ret;
> -			}
>  
>  			num_channels += ret;
>  		}
>