linux-kernel - [PATCH 5.4 258/408] rapidio: fix the missed put_device() for rio_mport_add

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Message-Id: <20201027135507.008945453@linuxfoundation.org>
Date:   Tue, 27 Oct 2020 14:53:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jing Xiangfeng <jingxiangfeng@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Matt Porter <mporter@...nel.crashing.org>,
        Alexandre Bounine <alex.bou9@...il.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        John Hubbard <jhubbard@...dia.com>,
        Kees Cook <keescook@...omium.org>,
        Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 258/408] rapidio: fix the missed put_device() for rio_mport_add_riodev

From: Jing Xiangfeng <jingxiangfeng@...wei.com>

[ Upstream commit 85094c05eeb47d195a74a25366a2db066f1c9d47 ]

rio_mport_add_riodev() misses to call put_device() when the device already
exists.  Add the missed function call to fix it.

Fixes: e8de370188d0 ("rapidio: add mport char device driver")
Signed-off-by: Jing Xiangfeng <jingxiangfeng@...wei.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>
Cc: Matt Porter <mporter@...nel.crashing.org>
Cc: Alexandre Bounine <alex.bou9@...il.com>
Cc: Gustavo A. R. Silva <gustavoars@...nel.org>
Cc: John Hubbard <jhubbard@...dia.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
Link: https://lkml.kernel.org/r/20200922072525.42330-1-jingxiangfeng@huawei.com
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/rapidio/devices/rio_mport_cdev.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c
index 1222522b4ae76..2b08fdeb87c18 100644
--- a/drivers/rapidio/devices/rio_mport_cdev.c
+++ b/drivers/rapidio/devices/rio_mport_cdev.c
@@ -1683,6 +1683,7 @@ static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
 	struct rio_dev *rdev;
 	struct rio_switch *rswitch = NULL;
 	struct rio_mport *mport;
+	struct device *dev;
 	size_t size;
 	u32 rval;
 	u32 swpinfo = 0;
@@ -1697,8 +1698,10 @@ static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
 	rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name,
 		   dev_info.comptag, dev_info.destid, dev_info.hopcount);
 
-	if (bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name)) {
+	dev = bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name);
+	if (dev) {
 		rmcd_debug(RDEV, "device %s already exists", dev_info.name);
+		put_device(dev);
 		return -EEXIST;
 	}
 
-- 
2.25.1