[PATCH 07/28] mfd: db8500-prcmu: Make AB8500 cell and IRQ resource static

[Lee Jones]

db8500_prcmu_register_ab8500() declares struct resource ab850x_resource
and the mfd_cell descriptors on the stack and assigns &ab850x_resource
to ab850x_cell->resources.  Although mfd_add_device() deep-copies the
resource table via platform_device_add_resources() before
db8500_prcmu_register_ab8500() returns, the shallow MFD cell copy
attached to the child platform device retains a stale pointer to the
expired stack frame.

Mark ab850x_resource as static and the ab8500_cell and ab8505_cell
descriptors as static const so the resource pointer remains valid for
the lifetime of the device.

Closes: https://sashiko.dev/#/bug/linux-554f3a1f-ca41-4078-ae9e-66d0d7fb4c9d
Signed-off-by: Lee Jones <lee@xxxxxxxxxx>
---
 drivers/mfd/db8500-prcmu.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index 6672c55f2ebc..cdfcbeb2a88c 100644
--- a/drivers/mfd/db8500-prcmu.c
+++ b/drivers/mfd/db8500-prcmu.c
@@ -2953,16 +2953,15 @@ static const struct mfd_cell db8500_prcmu_devs[] = {
 
 static int db8500_prcmu_register_ab8500(struct device *parent)
 {
-	struct device_node *np;
-	struct resource ab850x_resource;
-	const struct mfd_cell ab8500_cell = {
+	static struct resource ab850x_resource;
+	static const struct mfd_cell ab8500_cell = {
 		.name = "ab8500-core",
 		.of_compatible = "stericsson,ab8500",
 		.id = AB8500_VERSION_AB8500,
 		.resources = &ab850x_resource,
 		.num_resources = 1,
 	};
-	const struct mfd_cell ab8505_cell = {
+	static const struct mfd_cell ab8505_cell = {
 		.name = "ab8505-core",
 		.of_compatible = "stericsson,ab8505",
 		.id = AB8500_VERSION_AB8505,
@@ -2970,6 +2969,7 @@ static int db8500_prcmu_register_ab8500(struct device *parent)
 		.num_resources = 1,
 	};
 	const struct mfd_cell *ab850x_cell;
+	struct device_node *np;
 
 	if (!parent->of_node)
 		return -ENODEV;
-- 
2.56.0.218.g1ec904b173-goog