netdev - Re: [PATCH] gigaset: call module_put before restart of if

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Message-Id: <20110617.152800.1945884789188813626.davem@davemloft.net>
Date:	Fri, 17 Jun 2011 15:28:00 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	shved@...ras.ru
Cc:	hjlipp@....de, tilman@...p.cc, isdn@...ux-pingi.de,
	gigaset307x-common@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...ras.ru
Subject: Re: [PATCH] gigaset: call module_put before restart of if_open()

From: Pavel Shved <shved@...ras.ru>
Date: Fri, 17 Jun 2011 20:25:11 +0400

> if_open() calls try_module_get(), and after an attempt to lock a mutex
> the if_open() function may return -ERESTARTSYS without
> putting the module.  Then, when if_open() is executed again,
> try_module_get() is called making the reference counter of THIS_MODULE
> greater than one at successful exit from if_open().  The if_close()
> function puts the module only once, and as a result it can't be
> unloaded.
> 
> This patch adds module_put call before the return from if_open().
> 
> Found by Linux Driver Verification project (linuxtesting.org).
> 
> Signed-off-by: Pavel Shved <shved@...ras.ru>

Applied.
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