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Fix couple of UART issues

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- there was a small race in `uart_pattern_link_free`:
  `rx_pattern_pos.data` was accessed for reading outside spinlock
- `uart_flush_input` enabled
  `UART_INTR_RXFIFO_FULL|UART_INTR_RXFIFO_TOUT` intr mask on exit even
  if these flags weren't set when function was called

Closes https://github.com/espressif/esp-idf/pull/7023
This commit is contained in:
Andrey Starodubtsev 2021-05-14 18:41:35 +03:00 committed by Omar Chebib
parent 7dc2e5e545
commit b5b629c584
1 changed files with 18 additions and 6 deletions
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24
components/driver/uart.c
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@ -360,15 +360,16 @@ esp_err_t uart_disable_intr_mask(uart_port_t uart_num, uint32_t disable_mask)
static esp_err_t uart_pattern_link_free(uart_port_t uart_num)
{
int* pdata = NULL;
UART_ENTER_CRITICAL(&(uart_context[uart_num].spinlock));
if (p_uart_obj[uart_num]->rx_pattern_pos.data != NULL) {
int* pdata = p_uart_obj[uart_num]->rx_pattern_pos.data;
UART_ENTER_CRITICAL(&(uart_context[uart_num].spinlock));
pdata = p_uart_obj[uart_num]->rx_pattern_pos.data;
p_uart_obj[uart_num]->rx_pattern_pos.data = NULL;
p_uart_obj[uart_num]->rx_pattern_pos.wr = 0;
p_uart_obj[uart_num]->rx_pattern_pos.rd = 0;
UART_EXIT_CRITICAL(&(uart_context[uart_num].spinlock));
free(pdata);
}
UART_EXIT_CRITICAL(&(uart_context[uart_num].spinlock));
free(pdata);
return ESP_OK;
}
@ -1258,6 +1259,16 @@ esp_err_t uart_get_buffered_data_len(uart_port_t uart_num, size_t* size)
esp_err_t uart_flush(uart_port_t uart_num) __attribute__((alias("uart_flush_input")));
static esp_err_t uart_disable_intr_mask_and_return_prev(uart_port_t uart_num, uint32_t disable_mask, uint32_t* prev_mask)
{
UART_CHECK((uart_num < UART_NUM_MAX), "uart_num error", ESP_FAIL);
UART_ENTER_CRITICAL(&(uart_context[uart_num].spinlock));
*prev_mask = uart_hal_get_intr_ena_status(&uart_context[uart_num].hal) & disable_mask;
uart_hal_disable_intr_mask(&(uart_context[uart_num].hal), disable_mask);
UART_EXIT_CRITICAL(&(uart_context[uart_num].spinlock));
return ESP_OK;
}
esp_err_t uart_flush_input(uart_port_t uart_num)
{
UART_CHECK((uart_num < UART_NUM_MAX), "uart_num error", ESP_FAIL);
@ -1265,10 +1276,11 @@ esp_err_t uart_flush_input(uart_port_t uart_num)
uart_obj_t* p_uart = p_uart_obj[uart_num];
uint8_t* data;
size_t size;
uint32_t prev_mask;
//rx sem protect the ring buffer read related functions
xSemaphoreTake(p_uart->rx_mux, (portTickType)portMAX_DELAY);
uart_disable_rx_intr(p_uart_obj[uart_num]->uart_num);
uart_disable_intr_mask_and_return_prev(uart_num, UART_INTR_RXFIFO_FULL|UART_INTR_RXFIFO_TOUT, &prev_mask);
while(true) {
if(p_uart->rx_head_ptr) {
vRingbufferReturnItem(p_uart->rx_ring_buf, p_uart->rx_head_ptr);
@ -1311,7 +1323,7 @@ esp_err_t uart_flush_input(uart_port_t uart_num)
p_uart->rx_cur_remain = 0;
p_uart->rx_head_ptr = NULL;
uart_hal_rxfifo_rst(&(uart_context[uart_num].hal));
uart_enable_rx_intr(p_uart_obj[uart_num]->uart_num);
uart_enable_intr_mask(uart_num, prev_mask);
xSemaphoreGive(p_uart->rx_mux);
return ESP_OK;
}