net: phy: call state machine synchronously in phy_stop

mainline inclusion
from mainline-v4.20-rc1
commit e8cfd9d6
category: bugfix
bugzilla: NA
CVE: NA

----------------------------------------------------

phy_stop() may be called e.g. when suspending, therefore all needed
actions should be performed synchronously. Therefore add a synchronous
call to the state machine.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Tested-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Reviewed-by: NWeiwei Deng <dengweiwei@huawei.com>
Reviewed-by: NZhaohui Zhong <zhongzhaohui@huawei.com>
Reviewed-by: NYonglong Liu <liuyonglong@huawei.com>
Signed-off-by: NYou Shengzui <youshengzui@huawei.com>
Reviewed-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/net/phy/phy.c

@@ -861,6 +861,8 @@ void phy_stop(struct phy_device *phydev)
 out_unlock:
 	mutex_unlock(&phydev->lock);
 
+	phy_state_machine(&phydev->state_queue.work);
+
 	/* Cannot call flush_scheduled_work() here as desired because
 	 * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 	 * will not reenable interrupts.