USB: apple-mfi-fastcharge: fix reference leak in apple_mfi_fc_set_property

pm_runtime_get_sync() will increment pm usage at first and it
will resume the device later. If runtime of the device has
error or device is in inaccessible state(or other error state),
resume operation will fail. If we do not call put operation to
decrease the reference, the result is that this device cannot
enter the idle state and always stay busy or other non-idle
state.

Fixes: 249fa8217b846 ("USB: Add driver to control USB fast charge for iOS devices")
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Link: https://lore.kernel.org/r/20201102022650.67115-1-zhangqilong3@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/misc/apple-mfi-fastcharge.c b/drivers/usb/misc/apple-mfi-fastcharge.c
index 579d8c84de42cdede087ba775051c5ec18083639..9de0171b517763951b733774ca675aef94a29a7e 100644 (file)
--- a/drivers/usb/misc/apple-mfi-fastcharge.c
+++ b/drivers/usb/misc/apple-mfi-fastcharge.c
@@ -120,8 +120,10 @@ static int apple_mfi_fc_set_property(struct power_supply *psy,
        dev_dbg(&mfi->udev->dev, "prop: %d\n", psp);
 
        ret = pm_runtime_get_sync(&mfi->udev->dev);
-       if (ret < 0)
+       if (ret < 0) {
+               pm_runtime_put_noidle(&mfi->udev->dev);
                return ret;
+       }
 
        switch (psp) {
        case POWER_SUPPLY_PROP_CHARGE_TYPE: