linux-kernel - [PATCH 3.4 09/92] auxdisplay: ks0108: fix refcount

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Message-Id: <1460976397-5688-9-git-send-email-lizf@kernel.org>
Date:	Mon, 18 Apr 2016 18:45:14 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Sudip Mukherjee <sudip@...torindia.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 09/92] auxdisplay: ks0108: fix refcount

From: Sudip Mukherjee <sudipm.mukherjee@...il.com>

3.4.112-rc1 review patch.  If anyone has any objections, please let me know.

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


commit bab383de3b84e584b0f09227151020b2a43dc34c upstream.

parport_find_base() will implicitly do parport_get_port() which
increases the refcount. Then parport_register_device() will again
increment the refcount. But while unloading the module we are only
doing parport_unregister_device() decrementing the refcount only once.
We add an parport_put_port() to neutralize the effect of
parport_get_port().

Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/auxdisplay/ks0108.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/auxdisplay/ks0108.c b/drivers/auxdisplay/ks0108.c
index 5b93852..0d75285 100644
--- a/drivers/auxdisplay/ks0108.c
+++ b/drivers/auxdisplay/ks0108.c
@@ -139,6 +139,7 @@ static int __init ks0108_init(void)
 
 	ks0108_pardevice = parport_register_device(ks0108_parport, KS0108_NAME,
 		NULL, NULL, NULL, PARPORT_DEV_EXCL, NULL);
+	parport_put_port(ks0108_parport);
 	if (ks0108_pardevice == NULL) {
 		printk(KERN_ERR KS0108_NAME ": ERROR: "
 			"parport didn't register new device\n");
-- 
1.9.1