[HAL][USART] Remove __HAL_LOCK() and __HAL_UNLOCK() invocation from both HAL_xxx_RegisterCallback() and HAL_xxx_UnRegisterCallback()
Rationale: HAL_xxx_RegisterCallback() must be called before HAL_xxx_Init(), which creates the semaphore used when invoking __HAL_LOCK() and __HAL_UNLOCK(). Invoking __HAL_LOCK() and __HAL_UNLOCK() in HAL_xxx_RegisterCallback() means using the semaphore before its creation.
diff --git a/Src/stm32l4xx_hal_usart.c b/Src/stm32l4xx_hal_usart.c
index 5a37355..c51e8ab 100644
--- a/Src/stm32l4xx_hal_usart.c
+++ b/Src/stm32l4xx_hal_usart.c
@@ -418,6 +418,8 @@
/**
* @brief Register a User USART Callback
* To be used instead of the weak predefined callback
+ * @note The HAL_USART_RegisterCallback() may be called before HAL_USART_Init() in HAL_USART_STATE_RESET
+ * to register callbacks for HAL_USART_MSPINIT_CB_ID and HAL_USART_MSPDEINIT_CB_ID
* @param husart usart handle
* @param CallbackID ID of the callback to be registered
* This parameter can be one of the following values:
@@ -447,8 +449,6 @@
return HAL_ERROR;
}
- /* Process locked */
- __HAL_LOCK(husart);
if (husart->State == HAL_USART_STATE_READY)
{
@@ -539,15 +539,14 @@
status = HAL_ERROR;
}
- /* Release Lock */
- __HAL_UNLOCK(husart);
-
return status;
}
/**
* @brief Unregister an USART Callback
* USART callaback is redirected to the weak predefined callback
+ * @note The HAL_USART_UnRegisterCallback() may be called before HAL_USART_Init() in HAL_USART_STATE_RESET
+ * to un-register callbacks for HAL_USART_MSPINIT_CB_ID and HAL_USART_MSPDEINIT_CB_ID
* @param husart usart handle
* @param CallbackID ID of the callback to be unregistered
* This parameter can be one of the following values:
@@ -568,9 +567,6 @@
{
HAL_StatusTypeDef status = HAL_OK;
- /* Process locked */
- __HAL_LOCK(husart);
-
if (HAL_USART_STATE_READY == husart->State)
{
switch (CallbackID)
@@ -660,9 +656,6 @@
status = HAL_ERROR;
}
- /* Release Lock */
- __HAL_UNLOCK(husart);
-
return status;
}
#endif /* USE_HAL_USART_REGISTER_CALLBACKS */
