power: supply: ab8500: Avoid NULL pointers

[ Upstream commit 5bcb5087c9dd3dca1ff0ebd8002c5313c9332b56 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/power/supply/ab8500_charger.c b/drivers/power/supply/ab8500_charger.c
index 98b335042ba6b6e7259933f63b1ef375b30dac13..76b6c60cde80e30111657798bbdad9cc2bbd224f 100644 (file)
--- a/drivers/power/supply/ab8500_charger.c
+++ b/drivers/power/supply/ab8500_charger.c
@@ -407,6 +407,14 @@ disable_otp:
 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 &&
@@ -433,7 +441,15 @@ 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);