usb: cdns3: Fix runtime PM imbalance on error

stable inclusion
from stable-v5.10.44
commit 2f523cd4a9311cba629facc7d353eabbd492bd5b
bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=345
CVE: NA

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

[ Upstream commit 07adc022 ]

When cdns3_gadget_start() fails, a pairing PM usage counter
decrement is needed to keep the counter balanced.

Signed-off-by: Dinghao Liu <dinghao.liu(a)zju.edu.cn>
Link: https://lore.kernel.org/r/20210412054908.7975-1-dinghao.liu(a)zju.edu.cn
Signed-off-by: Peter Chen <peter.chen(a)kernel.org>
Signed-off-by: Sasha Levin <sashal(a)kernel.org>
Signed-off-by: Xu Zehui <zehuixu(a)whu.edu.cn>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/usb/cdns3/gadget.c

@@ -3255,8 +3255,10 @@ static int __cdns3_gadget_init(struct cdns3 *cdns)
 	pm_runtime_get_sync(cdns->dev);
 
 	ret = cdns3_gadget_start(cdns);
-	if (ret)
+	if (ret) {
+		pm_runtime_put_sync(cdns->dev);
 		return ret;
+	}
 
 	/*
 	 * Because interrupt line can be shared with other components in