linux-kernel - [PATCH AUTOSEL 5.4 04/31] usb: cdns3: Fix runtime PM imbalance on error

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Message-Id: <20210603170919.3169112-4-sashal@kernel.org>
Date:   Thu,  3 Jun 2021 13:08:52 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dinghao Liu <dinghao.liu@....edu.cn>,
        Peter Chen <peter.chen@....com>,
        Felipe Balbi <balbi@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-usb@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 04/31] usb: cdns3: Fix runtime PM imbalance on error

From: Dinghao Liu <dinghao.liu@....edu.cn>

[ Upstream commit e5b913496099527abe46e175e5e2c844367bded0 ]

pm_runtime_get_sync() increments the runtime PM usage counter even
when it returns an error code. Thus a pairing decrement is needed on
the error handling path to keep the counter balanced.

Reviewed-by: Peter Chen <peter.chen@....com>
Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
Signed-off-by: Felipe Balbi <balbi@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/cdns3/gadget.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
index c0c39cf30387..f32f00c49571 100644
--- a/drivers/usb/cdns3/gadget.c
+++ b/drivers/usb/cdns3/gadget.c
@@ -2706,8 +2706,10 @@ 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
-- 
2.30.2