This is a note to let you know that I've just added the patch titled
mtd: mtdpart: Don't create platform device that'll never probe
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mtd-mtdpart-don-t-create-platform-device-that-ll-nev.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit af5a6d2f7fe19ac6f0b5f930150b40c9b3d07222
Author: Saravana Kannan <saravanak@xxxxxxxxxx>
Date: Mon Feb 6 17:42:04 2023 -0800
mtd: mtdpart: Don't create platform device that'll never probe
[ Upstream commit fb42378dcc7f247df56f0ecddfdae85487495fbc ]
These "nvmem-cells" platform devices never get probed because there's no
platform driver for it and it's never used anywhere else. So it's a
waste of memory. These devices also cause fw_devlink to block nvmem
consumers of "nvmem-cells" partition from probing because the supplier
device never probes.
So stop creating platform devices for nvmem-cells partitions to avoid
wasting memory and to avoid blocking probing of consumers.
Reported-by: Maxim Kiselev <bigunclemax@xxxxxxxxx>
Fixes: bcdf0315a61a ("mtd: call of_platform_populate() for MTD partitions")
Signed-off-by: Saravana Kannan <saravanak@xxxxxxxxxx>
Tested-by: Maksim Kiselev <bigunclemax@xxxxxxxxx>
Tested-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Tested-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Tested-by: Luca Weiss <luca.weiss@xxxxxxxxxxxxx> # qcom/sm7225-fairphone-fp4
Link: https://lore.kernel.org/r/20230207014207.1678715-13-saravanak@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index d442fa94c8720..85f5ee6f06fc6 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -577,6 +577,7 @@ static int mtd_part_of_parse(struct mtd_info *master,
{
struct mtd_part_parser *parser;
struct device_node *np;
+ struct device_node *child;
struct property *prop;
struct device *dev;
const char *compat;
@@ -594,6 +595,15 @@ static int mtd_part_of_parse(struct mtd_info *master,
else
np = of_get_child_by_name(np, "partitions");
+ /*
+ * Don't create devices that are added to a bus but will never get
+ * probed. That'll cause fw_devlink to block probing of consumers of
+ * this partition until the partition device is probed.
+ */
+ for_each_child_of_node(np, child)
+ if (of_device_is_compatible(child, "nvmem-cells"))
+ of_node_set_flag(child, OF_POPULATED);
+
of_property_for_each_string(np, "compatible", prop, compat) {
parser = mtd_part_get_compatible_parser(compat);
if (!parser)
