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authorMiquel Raynal <miquel.raynal@bootlin.com>2018-09-07 16:35:54 +0200
committerBoris Brezillon <boris.brezillon@bootlin.com>2018-09-17 16:23:12 +0200
commit85516a9881a31e2c7a8d10f4697f3adcccc7cef1 (patch)
tree99792a8113d8f0e49ca23caa0be5991d07de055c /drivers/mtd/mtdpart.c
parentcf51e4b9c34407bf0c3d9b582b7837e047e1df47 (diff)
downloadlinux-85516a9881a31e2c7a8d10f4697f3adcccc7cef1.tar.bz2
mtd: partitions: fix unbalanced of_node_get/put()
While at first mtd_part_of_parse() would just call of_get_chil_by_name(), it has been patched to deal with sub-partitions and will now directly manipulate the node returned by mtd_get_of_node() if the MTD device is a partition. 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. 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> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Diffstat (limited to 'drivers/mtd/mtdpart.c')
-rw-r--r--drivers/mtd/mtdpart.c5
1 files changed, 4 insertions, 1 deletions
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)