vregion: call vregion_set_interim() from pipeline_comp_complete()

Move the vregion_set_interim() call from module_prepare() to
pipeline_comp_complete(). For DP modules vregion_set_interim() cannot
be called from userspace, so call it directly from the pipeline
completion path which runs in kernel context.

Add a null check for the alloc object before dereferencing it.

Author: Jyri Sarha

src/audio/module_adapter/module/generic.c

@@ -503,10 +503,6 @@ int module_prepare(struct processing_module *mod,
 
 	comp_dbg(dev, "entry");
 
-	/* Switch vregion to interim allocation mode for prepare and beyond */
-	if (md->resources.alloc && md->resources.alloc->vreg)
-		vregion_set_interim(md->resources.alloc->vreg);
-
 #if CONFIG_IPC_MAJOR_3
 	if (mod->priv.state == MODULE_IDLE)
 		return 0;

src/audio/pipeline/pipeline-graph.c

@@ -7,8 +7,10 @@
 
 #include <sof/audio/buffer.h>
 #include <sof/audio/component_ext.h>
+#include <sof/audio/module_adapter/module/generic.h>
 #include <sof/audio/pipeline.h>
 #include <sof/ipc/msg.h>
+#include <sof/lib/vregion.h>
 #include <rtos/interrupt.h>
 #include <rtos/symbol.h>
 #include <rtos/alloc.h>
@@ -287,8 +289,14 @@ static int pipeline_comp_complete(struct comp_dev *current,
 	 * It will be calculated during module prepare operation
 	 * either by the module or to default value based on module's OBS
 	 */
-	if (current->ipc_config.proc_domain == COMP_PROCESSING_DOMAIN_LL)
+	if (current->ipc_config.proc_domain == COMP_PROCESSING_DOMAIN_LL) {
 		current->period = ppl_data->p->period;
+	} else {
+		struct processing_module *mod = comp_mod(current);
+
+		if (mod->priv.resources.alloc)
+			vregion_set_interim(mod->priv.resources.alloc->vreg);
+	}
 
 	current->priority = ppl_data->p->priority;