linux-kernel - Re: [PATCH v2] staging: panel: fix stackdump

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Message-ID: <20150512112712.GP14154@mwanda>
Date:	Tue, 12 May 2015 14:27:13 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	Willy Tarreau <willy@...a-x.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] staging: panel: fix stackdump

On Tue, May 12, 2015 at 04:45:44PM +0530, Sudip Mukherjee wrote:
> if we load the module, unload and then again try to load the module, we
> will get a stackdump. In the module_exit function we are unregistering
> the device and releasing the parport. So when we reach the detach
> function parport is already null and the unregister_reboot_notifier()
> is never called. When we again try to load the module it again tries
> register_reboot_notifier() and gives us a stackdump as its earlier
> registration is still not removed. It was caused by the commit
> <bb046fef9668baf1c4744a3c7aba05e15e44c9ac>.

The right format is:

commit bb046fef9668 ('staging: panel: register reboot')

It is in case human beings reading your description don't remember which
patch bb046fef9668 was.

> Fix this by moving all the unregistering and releasing in the detach
> function, which should be the ideal case as the detach will be called if
> we try to unregister the driver or if the parport is removed.
> 

We also have the Fixes: tag.

Fixes: bb046fef9668 ('staging: panel: register reboot')

> Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>

regards,
dan carpenter

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