feat(usb_host): Mutex acquire early bail

Author: peter-marcisovsky

host/usb/private_include/usbh.h

@@ -328,6 +328,8 @@ void usbh_devs_set_pm_actions_all(usbh_dev_ctrl_t device_ctrl);
  *    - ESP_OK: All devices flush/halt successful
  *    - ESP_ERR_INVALID_STATE: USBH driver is not installed
  *    - ESP_ERR_INVALID_SIZE: Too many devices connected for synchronous handling
+ *    - ESP_ERR_NOT_FINISHED: usb host lib busy, mutex to process the EPs can't be acquired. We bail the auto-suspend
+ *                            operation in favor of a low latency to enter light sleep.
  */
 esp_err_t usbh_devs_halt_flush_all_sync(void);
 #endif // AUTO_PM_LIGHT_SLEEP

host/usb/src/usbh.c

@@ -1120,7 +1120,11 @@ esp_err_t usbh_devs_halt_flush_all_sync(void)
 {
     esp_err_t ret;
     USBH_CHECK(p_usbh_obj != NULL, ESP_ERR_INVALID_STATE);
-    xSemaphoreTake(p_usbh_obj->constant.mux_lock, portMAX_DELAY);
+
+    // Try to acquire mutex, if busy, bail the auto supend in favour of low latency to enter the light sleep
+    if (xSemaphoreTake(p_usbh_obj->constant.mux_lock, 0) != pdTRUE) {
+        return ESP_ERR_NOT_FINISHED;
+    }
 
     ESP_GOTO_ON_FALSE(p_usbh_obj->mux_protected.num_device <= USBH_MAX_SYNC_DEVS_HANDLED, ESP_ERR_INVALID_SIZE,
                       unlock, USBH_TAG, "Too many devices for synchronous handling");