[Intel-gfx] [PATCH 10/15] drm/i915: More checks for psr.enabled

[Daniel Vetter]

We need to make sure that no one else is using this in the
enable function and also that the work item hasn't raced
with the disabled function.

Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/intel_dp.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 923a9f6991f7..503809e4e6f3 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1844,6 +1844,11 @@ void intel_edp_psr_enable(struct intel_dp *intel_dp)
 		return;
 	}
 
+	if (dev_priv->psr.enabled) {
+		DRM_DEBUG_KMS("PSR already in use\n");
+		return;
+	}
+
 	/* Setup PSR once */
 	intel_edp_psr_setup(intel_dp);
 
@@ -1882,6 +1887,9 @@ static void intel_edp_psr_work(struct work_struct *work)
 		container_of(work, typeof(*dev_priv), psr.work.work);
 	struct intel_dp *intel_dp = dev_priv->psr.enabled;
 
+	if (!intel_dp)
+		return;
+
 	if (intel_edp_psr_match_conditions(intel_dp))
 		intel_edp_psr_do_enable(intel_dp);
 }
-- 
2.0.0