From: Christian Koenig <christian.koenig@amd.com>
Date: Wed, 16 May 2012 23:33:30 +0000 (+0200)
Subject: drm/radeon: apply Murphy's law to the kms irq code v3
X-Git-Tag: v3.6-rc1~83^2~44^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fb98257a9d9d2089972b18079d5bdd4412e107e2;p=pandora-kernel.git

drm/radeon: apply Murphy's law to the kms irq code v3

1. It is really dangerous to have more than one
   spinlock protecting the same information.

2. radeon_irq_set sometimes wasn't called with lock
   protection, so it can happen that more than one
   CPU would tamper with the irq regs at the same
   time.

3. The pm.gui_idle variable was assuming that the 3D
   engine wasn't becoming idle between testing the
   register and setting the variable. So just remove
   it and test the register directly.

v2: Also handle the hpd irq code the same way.
v3: Rename hpd parameter for clarification.

Signed-off-by: Christian Koenig <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
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