[PATCH] mfd: da9150: fix IRQ action memory leak on removal

[Guangshuo Li <lgs201920130244@gmail.com>]

da9150_remove() currently removes the regmap IRQ chip before removing
the MFD child devices. regmap_del_irq_chip() disposes the child IRQ
mappings and removes their IRQ descriptors.

The GPADC child registers an interrupt handler using
devm_request_threaded_irq(). When the child device is subsequently
removed, its device-managed cleanup calls free_irq(), which can no
longer find the corresponding IRQ descriptor. As a result, the
allocated struct irqaction is not freed, causing a memory leak.
The associated IRQ thread also cannot be stopped normally.

Remove the MFD child devices first so their interrupt handlers are
released while the IRQ mappings are still valid. Then remove the
regmap IRQ chip and its IRQ domain.

This issue was found by our static analysis tool under development.

Fixes: b8fce55c09d3 ("mfd: Add support for DA9150 combined charger & fuel-gauge device")
Cc: stable@vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
---
 drivers/mfd/da9150-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/da9150-core.c b/drivers/mfd/da9150-core.c
index 5c59cc869fb3..1b6dbbed60e7 100644
--- a/drivers/mfd/da9150-core.c
+++ b/drivers/mfd/da9150-core.c
@@ -474,8 +474,8 @@ static void da9150_remove(struct i2c_client *client)
 {
 	struct da9150 *da9150 = i2c_get_clientdata(client);
 
-	regmap_del_irq_chip(da9150->irq, da9150->regmap_irq_data);
 	mfd_remove_devices(da9150->dev);
+	regmap_del_irq_chip(da9150->irq, da9150->regmap_irq_data);
 	i2c_unregister_device(da9150->core_qif);
 }
 
-- 
2.43.0