From: Dmitry Kasatkin <d.kasatkin@samsung.com>
Date: Fri, 13 Jun 2014 15:55:47 +0000 (+0300)
Subject: ima: remove unnecessary i_mutex locking from ima_rdwr_violation_check()
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~151^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c50b964823ebb7f0a098878c399ce859cd38e9e;p=pandora-kernel.git

ima: remove unnecessary i_mutex locking from ima_rdwr_violation_check()

Before 2.6.39 inode->i_readcount was maintained by IMA. It was not atomic
and protected using spinlock. For 2.6.39, i_readcount was converted to
atomic and maintaining was moved VFS layer. Spinlock for some unclear
reason was replaced by i_mutex.

After analyzing the code, we came to conclusion that i_mutex locking is
unnecessary, especially when an IMA policy has not been defined.

This patch removes i_mutex locking from ima_rdwr_violation_check().

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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