linux-kernel - Re: [PATCH v3 2/4] block: partitions: populate fwnode

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Message-ID: <2de992b3-d71c-40f2-ad68-76a9f48338d4@kernel.dk>
Date: Wed, 26 Jun 2024 13:43:49 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Daniel Golle <daniel@...rotopia.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Ulf Hansson <ulf.hansson@...aro.org>,
 Hauke Mehrtens <hauke@...ke-m.de>, Felix Fietkau <nbd@....name>,
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
 Dave Chinner <dchinner@...hat.com>, Jan Kara <jack@...e.cz>,
 Christian Brauner <brauner@...nel.org>,
 Thomas Weißschuh <linux@...ssschuh.net>,
 Al Viro <viro@...iv.linux.org.uk>, Li Lingfeng <lilingfeng3@...wei.com>,
 Christian Heusel <christian@...sel.eu>, Min Li <min15.li@...sung.com>,
 Avri Altman <avri.altman@....com>, Adrian Hunter <adrian.hunter@...el.com>,
 Hannes Reinecke <hare@...e.de>, Mikko Rapeli <mikko.rapeli@...aro.org>,
 Yeqi Fu <asuk4.q@...il.com>, Victor Shih <victor.shih@...esyslogic.com.tw>,
 Christophe JAILLET <christophe.jaillet@...adoo.fr>,
 Li Zhijian <lizhijian@...itsu.com>,
 "Ricardo B. Marliere" <ricardo@...liere.net>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
 linux-block@...r.kernel.org
Subject: Re: [PATCH v3 2/4] block: partitions: populate fwnode

On 6/25/24 8:50 PM, Daniel Golle wrote:
> diff --git a/block/partitions/core.c b/block/partitions/core.c
> index ab76e64f0f6c..f88829e254e6 100644
> --- a/block/partitions/core.c
> +++ b/block/partitions/core.c
> @@ -10,6 +10,8 @@
>  #include <linux/ctype.h>
>  #include <linux/vmalloc.h>
>  #include <linux/raid/detect.h>
> +#include <linux/property.h>
> +
>  #include "check.h"
>  
>  static int (*const check_part[])(struct parsed_partitions *) = {
> @@ -281,6 +283,42 @@ static ssize_t whole_disk_show(struct device *dev,
>  }
>  static const DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL);
>  
> +static struct fwnode_handle *find_partition_fwnode(struct block_device *bdev)
> +{
> +	struct fwnode_handle *fw_parts, *fw_part;
> +	struct device *ddev = disk_to_dev(bdev->bd_disk);
> +	const char *partname, *uuid;
> +	u32 partno;
> +
> +	fw_parts = device_get_named_child_node(ddev, "partitions");
> +	if (!fw_parts)
> +		fw_parts = device_get_named_child_node(ddev->parent, "partitions");
> +
> +	if (!fw_parts)
> +		return NULL;

That last if check should to inside the previous one.

> +	fwnode_for_each_child_node(fw_parts, fw_part) {
> +		if (!fwnode_property_read_string(fw_part, "uuid", &uuid) &&
> +		    (!bdev->bd_meta_info || strlen(uuid) > PARTITION_META_INFO_UUIDLTH ||
> +		     strncmp(uuid, bdev->bd_meta_info->uuid, PARTITION_META_INFO_UUIDLTH)))
> +			continue;
> +
> +		if (!fwnode_property_read_string(fw_part, "partname", &partname) &&
> +		    (!bdev->bd_meta_info || strlen(uuid) > PARTITION_META_INFO_VOLNAMELTH ||
> +		     strncmp(partname, bdev->bd_meta_info->volname,
> +			     PARTITION_META_INFO_VOLNAMELTH)))
> +			continue;

This is pretty hard to make sense of...

-- 
Jens Axboe