diff --git a/Src/stm32f3xx_hal_uart.c b/Src/stm32f3xx_hal_uart.c
index 41e204f..aaa9182 100644
--- a/Src/stm32f3xx_hal_uart.c
+++ b/Src/stm32f3xx_hal_uart.c
@@ -1091,8 +1091,6 @@
       return  HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     huart->ErrorCode = HAL_UART_ERROR_NONE;
     huart->gState = HAL_UART_STATE_BUSY_TX;
 
@@ -1114,8 +1112,6 @@
       pdata16bits = NULL;
     }
 
-    __HAL_UNLOCK(huart);
-
     while (huart->TxXferCount > 0U)
     {
       if (UART_WaitOnFlagUntilTimeout(huart, UART_FLAG_TXE, RESET, tickstart, Timeout) != HAL_OK)
@@ -1177,8 +1173,6 @@
       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;
@@ -1205,8 +1199,6 @@
       pdata16bits = NULL;
     }
 
-    __HAL_UNLOCK(huart);
-
     /* as long as data have to be received */
     while (huart->RxXferCount > 0U)
     {
@@ -1258,8 +1250,6 @@
       return HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     huart->pTxBuffPtr  = (uint8_t *) pData;
     huart->TxXferSize  = Size;
     huart->TxXferCount = Size;
@@ -1278,8 +1268,6 @@
       huart->TxISR = UART_TxISR_8BIT;
     }
 
-    __HAL_UNLOCK(huart);
-
     /* Enable the Transmit Data Register Empty interrupt */
     ATOMIC_SET_BIT(huart->Instance->CR1, USART_CR1_TXEIE);
 
@@ -1311,8 +1299,6 @@
       return HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     /* Set Reception type to Standard reception */
     huart->ReceptionType = HAL_UART_RECEPTION_STANDARD;
 
@@ -1351,8 +1337,6 @@
       return HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     huart->pTxBuffPtr  = (uint8_t *) pData;
     huart->TxXferSize  = Size;
     huart->TxXferCount = Size;
@@ -1380,8 +1364,6 @@
         /* 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;
 
@@ -1391,8 +1373,6 @@
     /* 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);
@@ -1427,8 +1407,6 @@
       return HAL_ERROR;
     }
 
-    __HAL_LOCK(huart);
-
     /* Set Reception type to Standard reception */
     huart->ReceptionType = HAL_UART_RECEPTION_STANDARD;
 
@@ -1457,8 +1435,6 @@
   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))
   {
@@ -1476,8 +1452,6 @@
     ATOMIC_CLEAR_BIT(huart->Instance->CR3, USART_CR3_DMAR);
   }
 
-  __HAL_UNLOCK(huart);
-
   return HAL_OK;
 }
 
@@ -1488,8 +1462,6 @@
   */
 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 */
@@ -1511,8 +1483,6 @@
     ATOMIC_SET_BIT(huart->Instance->CR3, USART_CR3_DMAR);
   }
 
-  __HAL_UNLOCK(huart);
-
   return HAL_OK;
 }
 
@@ -3238,8 +3208,6 @@
     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)
   { 
@@ -3291,15 +3259,12 @@
       /* 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/stm32f3xx_hal_uart_ex.c b/Src/stm32f3xx_hal_uart_ex.c
index 540e981..ccd2379 100644
--- a/Src/stm32f3xx_hal_uart_ex.c
+++ b/Src/stm32f3xx_hal_uart_ex.c
@@ -487,8 +487,6 @@
       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;
@@ -516,8 +514,6 @@
       pdata16bits = NULL;
     }
 
-    __HAL_UNLOCK(huart);
-
     /* Initialize output number of received elements */
     *RxLen = 0U;
 
@@ -610,8 +606,6 @@
       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;
@@ -673,8 +667,6 @@
       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;