From: Ming Lei <ming.lei@canonical.com>
Date: Sat, 4 Aug 2012 04:01:23 +0000 (+0800)
Subject: firmware loader: fix device lifetime
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~76^2~80
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0cfc1e1e7b5347b4b6df1212f365ce6620bdd98f;p=pandora-kernel.git

firmware loader: fix device lifetime

Callers of request_firmware* must hold the reference count of
@device, otherwise it is easy to trigger oops since the firmware
loader device is the child of @device.

This patch adds comments about the usage. In fact, most of drivers
call request_firmware* in its probe() or open(), so the constraint
should be reasonable and can be satisfied.

Also this patch holds the reference count of @device before
schedule_work() in request_firmware_nowait() to avoid that
the @device is released after request_firmware_nowait returns
and before the worker function is scheduled.

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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