diff --git a/Src/stm32l4xx_hal_smartcard.c b/Src/stm32l4xx_hal_smartcard.c
index 06a7f13..ab5eedd 100644
--- a/Src/stm32l4xx_hal_smartcard.c
+++ b/Src/stm32l4xx_hal_smartcard.c
@@ -482,6 +482,9 @@
 /**
   * @brief  Register a User SMARTCARD Callback
   *         To be used instead of the weak predefined callback
+  * @note   The HAL_SMARTCARD_RegisterCallback() may be called before HAL_SMARTCARD_Init()
+  *         in HAL_SMARTCARD_STATE_RESET to register callbacks for HAL_SMARTCARD_MSPINIT_CB_ID
+  *         and HAL_SMARTCARD_MSPDEINIT_CB_ID
   * @param  hsmartcard smartcard handle
   * @param  CallbackID ID of the callback to be registered
   *         This parameter can be one of the following values:
@@ -511,8 +514,6 @@
 
     return HAL_ERROR;
   }
-  /* Process locked */
-  __HAL_LOCK(hsmartcard);
 
   if (hsmartcard->gState == HAL_SMARTCARD_STATE_READY)
   {
@@ -600,15 +601,15 @@
     status =  HAL_ERROR;
   }
 
-  /* Release Lock */
-  __HAL_UNLOCK(hsmartcard);
-
   return status;
 }
 
 /**
   * @brief  Unregister an SMARTCARD callback
   *         SMARTCARD callback is redirected to the weak predefined callback
+  * @note   The HAL_SMARTCARD_UnRegisterCallback() may be called before HAL_SMARTCARD_Init()
+  *         in HAL_SMARTCARD_STATE_RESET to un-register callbacks for HAL_SMARTCARD_MSPINIT_CB_ID
+  *         and HAL_SMARTCARD_MSPDEINIT_CB_ID
   * @param  hsmartcard smartcard handle
   * @param  CallbackID ID of the callback to be unregistered
   *         This parameter can be one of the following values:
@@ -629,9 +630,6 @@
 {
   HAL_StatusTypeDef status = HAL_OK;
 
-  /* Process locked */
-  __HAL_LOCK(hsmartcard);
-
   if (HAL_SMARTCARD_STATE_READY == hsmartcard->gState)
   {
     switch (CallbackID)
@@ -719,9 +717,6 @@
     status =  HAL_ERROR;
   }
 
-  /* Release Lock */
-  __HAL_UNLOCK(hsmartcard);
-
   return status;
 }
 #endif /* USE_HAL_SMARTCARD_REGISTER_CALLBACKS */