From 5bcb5087c9dd3dca1ff0ebd8002c5313c9332b56 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Sun, 23 May 2021 00:50:41 +0200
Subject: [PATCH] power: supply: ab8500: Avoid NULL pointers
Git-commit: 5bcb5087c9dd3dca1ff0ebd8002c5313c9332b56
Patch-mainline: v5.14-rc1
References: git-fixes

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>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 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);
-- 
2.26.2