commit 2e503bbb435ae418aebbe4aeede1c6f2a33d6f74
author Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Sun Jun 26 23:20:55 2011 +0900
committer James Morris <jmorris@namei.org> Wed Jun 29 09:31:21 2011 +1000
tree c6b783c245716cf87b337b2a855e742133afb7ac
parent 5625f2e3266319fd29fe4f1c76ccd3f550c79ac4

TOMOYO: Fix lockdep warning.

Currently TOMOYO holds SRCU lock upon open() and releases it upon close()
because list elements stored in the "struct tomoyo_io_buffer" instances are
accessed until close() is called. However, such SRCU usage causes lockdep to
complain about leaving the kernel with SRCU lock held.

This patch solves the warning by holding/releasing SRCU upon each
read()/write(). This patch is doing something similar to calling kfree()
without calling synchronize_srcu(), by selectively deferring kfree() by keeping
track of the "struct tomoyo_io_buffer" instances.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>