tree 8d87fe2573694a91f8ae46e5bb90d2096c1a45a4
parent d0fd64c1de437bdf91c32d4f84a53fa4b2150348
author Pavel Shved <shved@ispras.ru> 1308291911 +0000
committer David S. Miller <davem@conan.davemloft.net> 1308338852 -0400

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>