Re: [PATCH RESEND 3/4] mtd: partitions: add of_match_table parser matching

[Brian Norris <computersforpeace-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On Thu, Apr 20, 2017 at 03:57:30PM +0200, Rafał Miłecki wrote:
> From: Brian Norris <computersforpeace-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> 
> Partition parsers can now provide an of_match_table to enable
> flash<-->parser matching via device tree.
> 
> This support is currently limited to built-in parsers as it uses
> request_module() and friends. This should be sufficient for most cases
> though as compiling parsers as modules isn't a common choice.
> 
> Signed-off-by: Brian Norris <computersforpeace-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Signed-off-by: Rafał Miłecki <rafal-g1n6cQUeyibVItvQsEIGlw@public.gmane.org>
> ---
>  drivers/mtd/mtdpart.c          | 47 ++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mtd/partitions.h |  1 +
>  2 files changed, 48 insertions(+)

Seems like a valid refactoring of my original work, esp. given that
of_mtd.c went away since then:

Acked-by: Brian Norris <computersforpeac-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

> diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
> index 73c52f1a2e4c..d0cb1a892ed2 100644
> --- a/drivers/mtd/mtdpart.c
> +++ b/drivers/mtd/mtdpart.c
> @@ -861,6 +861,41 @@ static int mtd_part_do_parse(struct mtd_part_parser *parser,
>  	return ret;
>  }
>  
> +static bool of_mtd_match_mtd_parser(struct mtd_info *mtd,
> +				    struct mtd_part_parser *parser)
> +{
> +	struct device_node *np;
> +	bool ret;
> +
> +	np = mtd_get_of_node(mtd);
> +	np = of_get_child_by_name(np, "partitions");
> +
> +	ret = !!of_match_node(parser->of_match_table, np);
> +
> +	of_node_put(np);
> +
> +	return ret;
> +}
> +
> +static struct mtd_part_parser *mtd_part_get_parser_by_of(struct mtd_info *mtd)
> +{
> +	struct mtd_part_parser *p, *ret = NULL;
> +
> +	spin_lock(&part_parser_lock);
> +
> +	list_for_each_entry(p, &part_parsers, list) {
> +		if (of_mtd_match_mtd_parser(mtd, p) &&
> +				try_module_get(p->owner)) {
> +			ret = p;
> +			break;
> +		}
> +	}
> +
> +	spin_unlock(&part_parser_lock);
> +
> +	return ret;
> +}
> +
>  /**
>   * parse_mtd_partitions - parse MTD partitions
>   * @master: the master partition (describes whole MTD device)
> @@ -913,6 +948,18 @@ int parse_mtd_partitions(struct mtd_info *master, const char *const *types,
>  		if (ret < 0 && !err)
>  			err = ret;
>  	}
> +
> +	parser = mtd_part_get_parser_by_of(master);
> +	if (!parser)
> +		return err;
> +
> +	ret = mtd_part_do_parse(parser, master, pparts, data);
> +	if (ret > 0)
> +		return 0;
> +	mtd_part_parser_put(parser);
> +	if (ret < 0 && !err)
> +		err = ret;
> +
>  	return err;
>  }
>  
> diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h
> index 2787e76c030f..073e1d8d5d17 100644
> --- a/include/linux/mtd/partitions.h
> +++ b/include/linux/mtd/partitions.h
> @@ -77,6 +77,7 @@ struct mtd_part_parser {
>  	struct list_head list;
>  	struct module *owner;
>  	const char *name;
> +	const struct of_device_id *of_match_table;
>  	int (*parse_fn)(struct mtd_info *, const struct mtd_partition **,
>  			struct mtd_part_parser_data *);
>  	void (*cleanup)(const struct mtd_partition *pparts, int nr_parts);
> -- 
> 2.11.0
> 
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