ipc: ipc4: helper: make ipc4_search_for_drv() userspace compatible

Do not use IRQ disable/enable when built for user-space. The driver list
is immutable by IPC processing time so no lock is needed.

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

Author: kv2019i

src/ipc/ipc4/helper.c

@@ -1228,11 +1228,19 @@ __cold static const struct comp_driver *ipc4_search_for_drv(const void *uuid)
 	struct list_item *clist;
 	const struct comp_driver *drv = NULL;
 	struct comp_driver_info *info;
+#ifndef CONFIG_SOF_USERSPACE_LL
 	uint32_t flags;
+#endif
 
 	assert_can_be_cold();
 
+	/* Driver list is populated at boot before IPC processing starts.
+	 * In user-space builds irq_local_disable() is privileged, but the
+	 * list is immutable by this point so no lock is needed.
+	 */
+#ifndef CONFIG_SOF_USERSPACE_LL
 	irq_local_disable(flags);
+#endif
 
 	/* search driver list with UUID */
 	list_for_item(clist, &drivers->list) {
@@ -1248,7 +1256,9 @@ __cold static const struct comp_driver *ipc4_search_for_drv(const void *uuid)
 		}
 	}
 
+#ifndef CONFIG_SOF_USERSPACE_LL
 	irq_local_enable(flags);
+#endif
 	return drv;
 }