From: Pavel Shved <shved@ispras.ru>
Date: Fri, 17 Jun 2011 06:25:11 +0000 (+0000)
Subject: gigaset: call module_put before restart of if_open()
X-Git-Tag: v3.0-rc4~5^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2f9381e98471837b631743270de988e78aad1f96;p=pandora-kernel.git

gigaset: call module_put before restart of if_open()

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@ispras.ru>
Signed-off-by: David S. Miller <davem@conan.davemloft.net>
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