From: Ming Lei <ming.lei@canonical.com>
Date: Sat, 4 Aug 2012 04:01:17 +0000 (+0800)
Subject: firmware loader: fix races during loading firmware
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~76^2~86
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=28eefa750b5e16b13bb869c2c4f7d624a43eb48b;p=pandora-kernel.git

firmware loader: fix races during loading firmware

This patch fixes two races in loading firmware:

1, FW_STATUS_DONE should be set before waking up the task waitting
on _request_firmware_load, otherwise FW_STATUS_ABORT may be
thought as DONE mistakenly.

2, Inside _request_firmware_load(), there is a small window between
wait_for_completion() and mutex_lock(&fw_lock), and 'echo 1 > loading'
still may happen during the period, so this patch checks FW_STATUS_DONE
to prevent pages' buffer completed from being freed in firmware_loading_store.

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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