[PATCH 5.10.y 3/3] power: supply: twl4030_charger: cancel workers via devm

[Sasha Levin <sashal@kernel.org>]

From: Maoyi Xie <maoyixie.tju@gmail.com>

[ Upstream commit 6eba34732524067da2aad5ddfdfbc641ded10e9e ]

bci is devm-allocated. Two workers (bci->work and bci->current_worker)
dereference it. twl4030_bci_remove() disables charging and masks
interrupts. It cancels neither worker. A worker pending at remove() can
run after devm frees bci.

The USB transceiver comes from devm_usb_get_phy_by_node(). devm
unregisters its notifier only after remove() returns. A cancel_work_sync()
in remove() can then race a notifier reschedule. devm_work_autocancel()
and devm_delayed_work_autocancel() avoid that. They cancel the workers
during devm release, before bci is freed.

The current_worker is registered first, since devm will cancel in
reverse order and bci->work can reschedule current_worker.

Suggested-by: Sebastian Reichel <sre@kernel.org>
Fixes: d6ccc442b1210 ("twl4030_charger: Make the driver atomic notifier safe")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20260702172128.2001753-1-maoyixie.tju@gmail.com
Signed-off-by: Maoyi Xie <maoyixie.tju@gmail.com>
Link: https://patch.msgid.link/20260725072540.3092504-1-maoyixie.tju@gmail.com
[Move comment about order into the commit message]
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/power/supply/twl4030_charger.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c
index 1bc49b2e12e8d..2c60a10ae5877 100644
--- a/drivers/power/supply/twl4030_charger.c
+++ b/drivers/power/supply/twl4030_charger.c
@@ -13,6 +13,7 @@
 #include <linux/slab.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
+#include <linux/devm-helpers.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/twl.h>
 #include <linux/power_supply.h>
@@ -1004,8 +1005,15 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, bci);
 
-	INIT_WORK(&bci->work, twl4030_bci_usb_work);
-	INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
+	ret = devm_delayed_work_autocancel(&pdev->dev, &bci->current_worker,
+					   twl4030_current_worker);
+	if (ret)
+		return ret;
+
+	ret = devm_work_autocancel(&pdev->dev, &bci->work,
+				   twl4030_bci_usb_work);
+	if (ret)
+		return ret;
 
 	bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
 	if (IS_ERR(bci->channel_vac)) {
-- 
2.53.0