diff --git a/Src/stm32l4xx_hal_uart.c b/Src/stm32l4xx_hal_uart.c
index a115166..dcc3614 100644
--- a/Src/stm32l4xx_hal_uart.c
+++ b/Src/stm32l4xx_hal_uart.c
@@ -1161,8 +1161,6 @@
       return  HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     huart->ErrorCode = HAL_UART_ERROR_NONE;
     huart->gState = HAL_UART_STATE_BUSY_TX;
 
@@ -1184,8 +1182,6 @@
       pdata16bits = NULL;
     }
 
-    __HAL_UNLOCK(huart);
-
     while (huart->TxXferCount > 0U)
     {
       if (UART_WaitOnFlagUntilTimeout(huart, UART_FLAG_TXE, RESET, tickstart, Timeout) != HAL_OK)
@@ -1251,8 +1247,6 @@
       return  HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     huart->ErrorCode = HAL_UART_ERROR_NONE;
     huart->RxState = HAL_UART_STATE_BUSY_RX;
     huart->ReceptionType = HAL_UART_RECEPTION_STANDARD;
@@ -1279,8 +1273,6 @@
       pdata16bits = NULL;
     }
 
-    __HAL_UNLOCK(huart);
-
     /* as long as data have to be received */
     while (huart->RxXferCount > 0U)
     {
@@ -1332,8 +1324,6 @@
       return HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     huart->pTxBuffPtr  = pData;
     huart->TxXferSize  = Size;
     huart->TxXferCount = Size;
@@ -1356,8 +1346,6 @@
         huart->TxISR = UART_TxISR_8BIT_FIFOEN;
       }
 
-      __HAL_UNLOCK(huart);
-
       /* Enable the TX FIFO threshold interrupt */
       ATOMIC_SET_BIT(huart->Instance->CR3, USART_CR3_TXFTIE);
     }
@@ -1373,8 +1361,6 @@
         huart->TxISR = UART_TxISR_8BIT;
       }
 
-      __HAL_UNLOCK(huart);
-
       /* Enable the Transmit Data Register Empty interrupt */
       ATOMIC_SET_BIT(huart->Instance->CR1, USART_CR1_TXEIE_TXFNFIE);
     }
@@ -1389,8 +1375,6 @@
       huart->TxISR = UART_TxISR_8BIT;
     }
 
-    __HAL_UNLOCK(huart);
-
     /* Enable the Transmit Data Register Empty interrupt */
     ATOMIC_SET_BIT(huart->Instance->CR1, USART_CR1_TXEIE);
 #endif /* USART_CR1_FIFOEN */
@@ -1423,8 +1407,6 @@
       return HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     /* Set Reception type to Standard reception */
     huart->ReceptionType = HAL_UART_RECEPTION_STANDARD;
 
@@ -1466,8 +1448,6 @@
       return HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     huart->pTxBuffPtr  = pData;
     huart->TxXferSize  = Size;
     huart->TxXferCount = Size;
@@ -1495,8 +1475,6 @@
         /* Set error code to DMA */
         huart->ErrorCode = HAL_UART_ERROR_DMA;
 
-        __HAL_UNLOCK(huart);
-
         /* Restore huart->gState to ready */
         huart->gState = HAL_UART_STATE_READY;
 
@@ -1506,8 +1484,6 @@
     /* Clear the TC flag in the ICR register */
     __HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_TCF);
 
-    __HAL_UNLOCK(huart);
-
     /* Enable the DMA transfer for transmit request by setting the DMAT bit
     in the UART CR3 register */
     ATOMIC_SET_BIT(huart->Instance->CR3, USART_CR3_DMAT);
@@ -1542,8 +1518,6 @@
       return HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     /* Set Reception type to Standard reception */
     huart->ReceptionType = HAL_UART_RECEPTION_STANDARD;
 
@@ -1575,8 +1549,6 @@
   const HAL_UART_StateTypeDef gstate = huart->gState;
   const HAL_UART_StateTypeDef rxstate = huart->RxState;
 
-  __HAL_LOCK(huart);
-
   if ((HAL_IS_BIT_SET(huart->Instance->CR3, USART_CR3_DMAT)) &&
       (gstate == HAL_UART_STATE_BUSY_TX))
   {
@@ -1594,8 +1566,6 @@
     ATOMIC_CLEAR_BIT(huart->Instance->CR3, USART_CR3_DMAR);
   }
 
-  __HAL_UNLOCK(huart);
-
   return HAL_OK;
 }
 
@@ -1606,8 +1576,6 @@
   */
 HAL_StatusTypeDef HAL_UART_DMAResume(UART_HandleTypeDef *huart)
 {
-  __HAL_LOCK(huart);
-
   if (huart->gState == HAL_UART_STATE_BUSY_TX)
   {
     /* Enable the UART DMA Tx request */
@@ -1629,8 +1597,6 @@
     ATOMIC_SET_BIT(huart->Instance->CR3, USART_CR3_DMAR);
   }
 
-  __HAL_UNLOCK(huart);
-
   return HAL_OK;
 }
 
@@ -3638,8 +3604,6 @@
       huart->RxISR = UART_RxISR_8BIT_FIFOEN;
     }
 
-    __HAL_UNLOCK(huart);
-
     /* Enable the UART Parity Error interrupt and RX FIFO Threshold interrupt */
     if (huart->Init.Parity != UART_PARITY_NONE)
     {
@@ -3659,8 +3623,6 @@
       huart->RxISR = UART_RxISR_8BIT;
     }
 
-    __HAL_UNLOCK(huart);
-
     /* Enable the UART Parity Error interrupt and Data Register Not Empty interrupt */
     if (huart->Init.Parity != UART_PARITY_NONE)
     {
@@ -3682,8 +3644,6 @@
     huart->RxISR = UART_RxISR_8BIT;
   }
 
-  __HAL_UNLOCK(huart);
-
   /* Enable the UART Parity Error interrupt and Data Register Not Empty interrupt */
   if (huart->Init.Parity != UART_PARITY_NONE)
   {
@@ -3736,15 +3696,12 @@
       /* Set error code to DMA */
       huart->ErrorCode = HAL_UART_ERROR_DMA;
 
-      __HAL_UNLOCK(huart);
-
       /* Restore huart->RxState to ready */
       huart->RxState = HAL_UART_STATE_READY;
 
       return HAL_ERROR;
     }
   }
-  __HAL_UNLOCK(huart);
 
   /* Enable the UART Parity Error Interrupt */
   if (huart->Init.Parity != UART_PARITY_NONE)
diff --git a/Src/stm32l4xx_hal_uart_ex.c b/Src/stm32l4xx_hal_uart_ex.c
index 5e6bd13..9323bb9 100644
--- a/Src/stm32l4xx_hal_uart_ex.c
+++ b/Src/stm32l4xx_hal_uart_ex.c
@@ -778,8 +778,6 @@
       return  HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     huart->ErrorCode = HAL_UART_ERROR_NONE;
     huart->RxState = HAL_UART_STATE_BUSY_RX;
     huart->ReceptionType = HAL_UART_RECEPTION_TOIDLE;
@@ -807,8 +805,6 @@
       pdata16bits = NULL;
     }
 
-    __HAL_UNLOCK(huart);
-
     /* Initialize output number of received elements */
     *RxLen = 0U;
 
@@ -901,8 +897,6 @@
       return HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     /* Set Reception type to reception till IDLE Event*/
     huart->ReceptionType = HAL_UART_RECEPTION_TOIDLE;
     huart->RxEventType = HAL_UART_RXEVENT_TC;
@@ -964,8 +958,6 @@
       return HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     /* Set Reception type to reception till IDLE Event*/
     huart->ReceptionType = HAL_UART_RECEPTION_TOIDLE;
     huart->RxEventType = HAL_UART_RXEVENT_TC;