From: Ming Lei <ming.lei@canonical.com>
Date: Sat, 4 Aug 2012 04:01:16 +0000 (+0800)
Subject: firmware loader: simplify pages ownership transfer
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~76^2~87
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=65710cb6ea315b3ef76a8a3da7be99afcf58d2bb;p=pandora-kernel.git

firmware loader: simplify pages ownership transfer

This patch doesn't transfer ownership of pages' buffer to the
instance of firmware until the firmware loading is completed,
which will simplify firmware_loading_store a lot, so help
to introduce the following cache_firmware and uncache_firmware
mechanism during system suspend-resume cycle.

In fact, this patch fixes one bug: if writing data into
firmware loader device is bypassed between writting 1 and 0 to
'loading', OOPS will be triggered without the patch.

Also handle the vmap failure case, and add some comments to make
code more readable.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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