[PATCH 1/2] drm/i915/guc: Don't double enable a context

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

If a context is blocked, unblocked and subitted repeatedly in rapid
succession, the driver can end up trying to enable the context while
the previous enable request is still in flight. This can lead to much
confusion in the state tracking.

Prevent that by checking the pending enable flag before trying to
enable a context.

Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index d37698bd6b91a..d399e4d238c10 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -720,7 +720,7 @@ static int __guc_add_request(struct intel_guc *guc, struct i915_request *rq)
 	if (unlikely(context_blocked(ce) && !intel_context_is_parent(ce)))
 		goto out;
 
-	enabled = context_enabled(ce) || context_blocked(ce);
+	enabled = context_enabled(ce) || context_blocked(ce) || context_pending_enable(ce);
 
 	if (!enabled) {
 		action[len++] = INTEL_GUC_ACTION_SCHED_CONTEXT_MODE_SET;
-- 
2.41.0