drm/amdkfd: Fix sdma queue allocate race condition

SDMA queue allocation requires the dqm lock as it modify
the global dqm members. Enclose it in the dqm_lock.

Signed-off-by: Oak Zeng <[e-mail]>
Reviewed-by: Philip Yang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c

···
 
 	if (q->properties.type == KFD_QUEUE_TYPE_SDMA ||
 		q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI) {
+		dqm_lock(dqm);
 		retval = allocate_sdma_queue(dqm, q);
+		dqm_unlock(dqm);
 		if (retval)
 			goto out;
 	}
···
 	deallocate_doorbell(qpd, q);
 out_deallocate_sdma_queue:
 	if (q->properties.type == KFD_QUEUE_TYPE_SDMA ||
-		q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI)
+		q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI) {
+		dqm_lock(dqm);
 		deallocate_sdma_queue(dqm, q);
+		dqm_unlock(dqm);
+	}
 out:
 	return retval;
 }