[RFC 01/14] drm/xe: Make exec_queue_kill safe to call twice

[Daniele Ceraolo Spurio]

An upcoming PXP patch will kill queues at runtime when a PXP
invalidation event occurs, so we need exec_queue_kill to be safe to call
multiple times.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
---
 drivers/gpu/drm/xe/xe_vm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index 5b166fa03684..02f684c0330d 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -280,8 +280,10 @@ void xe_vm_remove_compute_exec_queue(struct xe_vm *vm, struct xe_exec_queue *q)
 		return;
 
 	down_write(&vm->lock);
-	list_del(&q->lr.link);
-	--vm->preempt.num_exec_queues;
+	if (!list_empty(&q->lr.link)) {
+		list_del_init(&q->lr.link);
+		--vm->preempt.num_exec_queues;
+	}
 	if (q->lr.pfence) {
 		dma_fence_enable_sw_signaling(q->lr.pfence);
 		dma_fence_put(q->lr.pfence);
-- 
2.43.0