ipc: ipc-helper: make ipc_comp_free() user-space compatible

Use the component mutex when code is run in user-space instead
of directly blocking interrupts.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Author: kv2019i

src/ipc/ipc-helper.c

@@ -335,7 +335,16 @@ __cold int ipc_comp_free(struct ipc *ipc, uint32_t comp_id)
 		return -EINVAL;
 	}
 
+	/* Lock buffer lists to prevent racing with the LL scheduler.
+	 * In user-space builds, irq_local_disable() is a privileged
+	 * operation, so use the per-component list_mutex instead
+	 * (same pattern as PPL_LOCK in pipeline_disconnect()).
+	 */
+#ifdef CONFIG_SOF_USERSPACE_LL
+	k_mutex_lock(icd->cd->list_mutex, K_FOREVER);
+#else
 	irq_local_disable(flags);
+#endif
 	comp_dev_for_each_producer_safe(icd->cd, buffer, safe) {
 		comp_buffer_set_sink_component(buffer, NULL);
 		/* This breaks the list, but we anyway delete all buffers */
@@ -348,7 +357,11 @@ __cold int ipc_comp_free(struct ipc *ipc, uint32_t comp_id)
 		comp_buffer_reset_source_list(buffer);
 	}
 
+#ifdef CONFIG_SOF_USERSPACE_LL
+	k_mutex_unlock(icd->cd->list_mutex);
+#else
 	irq_local_enable(flags);
+#endif
 
 	/* free component and remove from list */
 	comp_free(icd->cd);