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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Thu, 6 May 2021 12:33:58 +0200
Subject: [PATCH] mtd: parsers: ofpart: fix parsing subpartitions
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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: 2d751203aacf ("mtd: parsers: ofpart: limit parsing of deprecated DT syntax
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
drivers/mtd/parsers/ofpart_core.c | 26 ++++++++++++++------------
1 file changed, 14 insertions(+), 12 deletions(-)
--- a/drivers/mtd/parsers/ofpart_core.c
+++ b/drivers/mtd/parsers/ofpart_core.c
@@ -57,20 +57,22 @@ static int parse_fixed_partitions(struct
if (!mtd_node)
return 0;
- ofpart_node = of_get_child_by_name(mtd_node, "partitions");
- if (!ofpart_node && !mtd_is_partition(master)) {
- /*
- * 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 (!mtd_is_partition(master)) { /* 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) {
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