linux-kernel - [007/111] Staging: panel: Prevent double-calling of parport_release

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Date:	Wed, 11 Aug 2010 16:53:48 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Peter Huewe <peterhuewe@....de>, Willy Tarreau <w@....eu>
Subject: [007/111] Staging: panel: Prevent double-calling of parport_release - fix oops.

2.6.32-stable review patch.  If anyone has any objections, please let us know.

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

From: Peter Huewe <peterhuewe@....de>

commit 060132ae42cce3f9d2fd34d9a17b98362b44b9f9 upstream.

This patch prevents the code from calling parport_release and
parport_unregister_device twice with the same arguments - and thus fixes an oops.

Rationale:
After the first call the parport is already released and the
handle isn't valid anymore and calling parport_release and
parport_unregister_device twice isn't a good idea.

Signed-off-by: Peter Huewe <peterhuewe@....de>
Acked-by: Willy Tarreau <w@....eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/staging/panel/panel.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/staging/panel/panel.c
+++ b/drivers/staging/panel/panel.c
@@ -2181,6 +2181,7 @@ int panel_init(void)
 		if (pprt) {
 			parport_release(pprt);
 			parport_unregister_device(pprt);
+			pprt = NULL;
 		}
 		parport_unregister_driver(&panel_driver);
 		printk(KERN_ERR "Panel driver version " PANEL_VERSION
@@ -2230,6 +2231,7 @@ static void __exit panel_cleanup_module(
 		/* TODO: free all input signals */
 		parport_release(pprt);
 		parport_unregister_device(pprt);
+		pprt = NULL;
 	}
 	parport_unregister_driver(&panel_driver);
 }


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