[PATCH 3/5 v2] power: supply: ab8500: Avoid NULL pointers

[Linus Walleij <linus.walleij@linaro.org>]

Sometimes the code will crash because we haven't enabled
AC or USB charging and thus not created the corresponding
psy device. Fix it by checking that it is there before
notifying.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v1->v2:
- Rebase on v5.13-rc1
---
 drivers/power/supply/ab8500_charger.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/power/supply/ab8500_charger.c b/drivers/power/supply/ab8500_charger.c
index af32cfae9f19..57fbfe3d8c03 100644
--- a/drivers/power/supply/ab8500_charger.c
+++ b/drivers/power/supply/ab8500_charger.c
@@ -415,6 +415,14 @@ static void ab8500_enable_disable_sw_fallback(struct ab8500_charger *di,
 static void ab8500_power_supply_changed(struct ab8500_charger *di,
 					struct power_supply *psy)
 {
+	/*
+	 * This happens if we get notifications or interrupts and
+	 * the platform has been configured not to support one or
+	 * other type of charging.
+	 */
+	if (!psy)
+		return;
+
 	if (di->autopower_cfg) {
 		if (!di->usb.charger_connected &&
 		    !di->ac.charger_connected &&
@@ -441,7 +449,15 @@ static void ab8500_charger_set_usb_connected(struct ab8500_charger *di,
 		if (!connected)
 			di->flags.vbus_drop_end = false;
 
-		sysfs_notify(&di->usb_chg.psy->dev.kobj, NULL, "present");
+		/*
+		 * Sometimes the platform is configured not to support
+		 * USB charging and no psy has been created, but we still
+		 * will get these notifications.
+		 */
+		if (di->usb_chg.psy) {
+			sysfs_notify(&di->usb_chg.psy->dev.kobj, NULL,
+				     "present");
+		}
 
 		if (connected) {
 			mutex_lock(&di->charger_attached_mutex);
-- 
2.31.1