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>
10 files changed