linux-kernel - [PATCH] tty: synclink_gt: release resources when synclink

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Message-ID: <20221114010734.314910-1-shaozhengchao@huawei.com>
Date:   Mon, 14 Nov 2022 09:07:34 +0800
From:   Zhengchao Shao <shaozhengchao@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <gregkh@...uxfoundation.org>,
        <jirislaby@...nel.org>
CC:     <akpm@...ux-foundation.org>, <paulkf@...rogate.com>,
        <weiyongjun1@...wei.com>, <yuehaibing@...wei.com>,
        <shaozhengchao@...wei.com>
Subject: [PATCH] tty: synclink_gt: release resources when synclink_gt driver open failed

When synclink_gt driver open failed, it doesn't release resources. Compile
tested only.

Fixes: d4c63b7c7450 ("synclink_gt fix module reference")
Fixes: 705b6c7b34f2 ("[PATCH] new driver synclink_gt")
Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
---
 drivers/tty/synclink_gt.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index 25e9befdda3a..4dea52486410 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -1441,14 +1441,15 @@ static int hdlcdev_open(struct net_device *dev)
 	/* generic HDLC layer open processing */
 	rc = hdlc_open(dev);
 	if (rc)
-		return rc;
+		goto err_open;
 
 	/* arbitrate between network and tty opens */
 	spin_lock_irqsave(&info->netlock, flags);
 	if (info->port.count != 0 || info->netcount != 0) {
 		DBGINFO(("%s hdlc_open busy\n", dev->name));
 		spin_unlock_irqrestore(&info->netlock, flags);
-		return -EBUSY;
+		rc = -EBUSY;
+		goto err_open_busy;
 	}
 	info->netcount=1;
 	spin_unlock_irqrestore(&info->netlock, flags);
@@ -1458,7 +1459,7 @@ static int hdlcdev_open(struct net_device *dev)
 		spin_lock_irqsave(&info->netlock, flags);
 		info->netcount=0;
 		spin_unlock_irqrestore(&info->netlock, flags);
-		return rc;
+		goto err_open_busy;
 	}
 
 	/* assert RTS and DTR, apply hardware settings */
@@ -1478,6 +1479,12 @@ static int hdlcdev_open(struct net_device *dev)
 	else
 		netif_carrier_off(dev);
 	return 0;
+
+err_open_busy:
+	hdlc_close(dev);
+err_open:
+	module_put(THIS_MODULE);
+	return rc;
 }
 
 /**
-- 
2.17.1