+ rapidio-devices-fix-missing-put_device-in-mport_cdev_open.patch added to mm-nonmm-unstable branch

+ rapidio-devices-fix-missing-put_device-in-mport_cdev_open.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: rapidio: devices: fix missing put_device in mport_cdev_open
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     rapidio-devices-fix-missing-put_device-in-mport_cdev_open.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/rapidio-devices-fix-missing-put_device-in-mport_cdev_open.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Cai Xinchen <caixinchen1@huawei.com>
Subject: rapidio: devices: fix missing put_device in mport_cdev_open
Date: Sat, 3 Dec 2022 08:57:21 +0000

When kfifo_alloc fails, the refcount of chdev->dev is left incremental. 
We should use put_device(&chdev->dev) to decrease the ref count of
chdev->dev to avoid refcount leak.

Link: https://lkml.kernel.org/r/20221203085721.13146-1-caixinchen1@huawei.com
Fixes: e8de370188d0 ("rapidio: add mport char device driver")
Signed-off-by: Cai Xinchen <caixinchen1@huawei.com>
Cc: Alexandre Bounine <alex.bou9@gmail.com>
Cc: Dan Carpenter <error27@gmail.com>
Cc: Jakob Koschel <jakobkoschel@gmail.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Wang Weiyang <wangweiyang2@huawei.com>
Cc: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/rapidio/devices/rio_mport_cdev.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/rapidio/devices/rio_mport_cdev.c~rapidio-devices-fix-missing-put_device-in-mport_cdev_open
+++ a/drivers/rapidio/devices/rio_mport_cdev.c
@@ -1912,6 +1912,7 @@ static int mport_cdev_open(struct inode
 			  sizeof(struct rio_event) * MPORT_EVENT_DEPTH,
 			  GFP_KERNEL);
 	if (ret < 0) {
+		put_device(&chdev->dev);
 		dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n");
 		ret = -ENOMEM;
 		goto err_fifo;
_

Patches currently in -mm which might be from caixinchen1@huawei.com are

rapidio-devices-fix-missing-put_device-in-mport_cdev_open.patch