While at first mtd_part_of_parse() would just call of_get_chil_by_name(), it has been edited to first try to get the OF node thanks to mtd_get_of_node() and fallback on of_get_child_by_name().
A of_node_put() was a bit below in the code, to balance the of_get_child_by_name(). However, despite its name, mtd_get_of_node() does not take a reference on the OF node. It is a simple helper hiding some pointer logic to retrieve the OF node related to an MTD device. People often used it this way:
of_node_put(mtd_get_of_node(<mtd>)).
The direct effect of such unbalanced reference counting is visible by rmmod'ing any module that would have added MTD partitions:
OF: ERROR: Bad of_node_put() on <of_path_to_partition>
As it seems normal to get a reference on the OF node during the of_property_for_each_string() that follows, add a call to of_node_get() when relevant.
Fixes: 76a832254ab0 ("mtd: partitions: use DT info for parsing partitions with "compatible" prop") Cc: stable@vger.kernel.org Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com --- drivers/mtd/mtdpart.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c index 52e2cb35fc79..99c460facd5e 100644 --- a/drivers/mtd/mtdpart.c +++ b/drivers/mtd/mtdpart.c @@ -873,8 +873,11 @@ static int mtd_part_of_parse(struct mtd_info *master, int ret, err = 0;
np = mtd_get_of_node(master); - if (!mtd_is_partition(master)) + if (mtd_is_partition(master)) + of_node_get(np); + else np = of_get_child_by_name(np, "partitions"); + of_property_for_each_string(np, "compatible", prop, compat) { parser = mtd_part_get_compatible_parser(compat); if (!parser)