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mtd: parsers: ofpart: fix parsing subpartitions 

ofpart was recently patched to not scan random partition nodes as
subpartitions. That change unfortunately broke scanning valid
subpartitions like:

partitions {
	compatible = "fixed-partitions";
	#address-cells = <1>;
	#size-cells = <1>;

	partition@0 {
		compatible = "fixed-partitions";
		label = "bootloader";
		reg = <0x0 0x100000>;

		partition@0 {
			label = "config";
			reg = <0x80000 0x80000>;
		};
	};
};

Fix that regression by adding 1 more code path. We actually need 3
conditional blocks to support 3 possible cases. This change also makes
code easier to understand & follow.

Reported-by: David Bauer <mail@david-bauer.net>
Fixes: 2d751203aa ("mtd: parsers: ofpart: limit parsing of deprecated DT syntax
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Tested-by: Andrew Cameron <apcameron@softhome.net>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210508173214.28365-1-zajec5@gmail.com
This commit is contained in:
Rafał Miłecki 2021-05-08 19:32:14 +02:00 committed by Miquel Raynal
parent 3d227a0b0c
commit 562b4e91d3
1 changed files with 14 additions and 12 deletions
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26
drivers/mtd/parsers/ofpart_core.c
View File

@ -57,20 +57,22 @@ static int parse_fixed_partitions(struct mtd_info *master,
if (!mtd_node)
return 0;
ofpart_node = of_get_child_by_name(mtd_node, "partitions");
if (!ofpart_node && !master->parent) {
/*
* We might get here even when ofpart isn't used at all (e.g.,
* when using another parser), so don't be louder than
* KERN_DEBUG
*/
pr_debug("%s: 'partitions' subnode not found on %pOF. Trying to parse direct subnodes as partitions.\n",
master->name, mtd_node);
if (!master->parent) { /* Master */
ofpart_node = of_get_child_by_name(mtd_node, "partitions");
if (!ofpart_node) {
/*
* We might get here even when ofpart isn't used at all (e.g.,
* when using another parser), so don't be louder than
* KERN_DEBUG
*/
pr_debug("%s: 'partitions' subnode not found on %pOF. Trying to parse direct subnodes as partitions.\n",
master->name, mtd_node);
ofpart_node = mtd_node;
dedicated = false;
}
} else { /* Partition */
ofpart_node = mtd_node;
dedicated = false;
}
if (!ofpart_node)
return 0;
of_id = of_match_node(parse_ofpart_match_table, ofpart_node);
if (dedicated && !of_id) {