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drivers/serial/serial_dma.c: Avoid uart_xmitchars_done() move the tail bigger then head. If ioctl(TCOFLUSH) occurs between uart_xmitchars_dma() and uart_xmitchars_done(), TCOFLUSH will reset xmit buffer, then uart_xmitchars_done() will move the 'tail' ahead of 'head', then sends lots of wrong data.

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ligd 2019-11-06 07:01:27 -06:00 committed by Gregory Nutt
parent 3e8366775f
commit 8fb19a4359
1 changed files with 11 additions and 4 deletions
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15
drivers/serial/serial_dma.c
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@ -193,11 +193,18 @@ void uart_xmitchars_done(FAR uart_dev_t *dev)
size_t nbytes = xfer->nbytes;
struct uart_buffer_s *txbuf = &dev->xmit;
/* Move tail for nbytes. */
/* Skip the update if the tail position change which mean
* someone reset (e.g. TCOFLUSH) the xmit buffer during DMA.
*/
txbuf->tail = (txbuf->tail + nbytes) % txbuf->size;
xfer->nbytes = 0;
xfer->length = xfer->nlength = 0;
if (xfer->buffer == &txbuf->buffer[txbuf->tail])
{
/* Move tail for nbytes. */
txbuf->tail = (txbuf->tail + nbytes) % txbuf->size;
xfer->nbytes = 0;
xfer->length = xfer->nlength = 0;
}
/* If any bytes were removed from the buffer, inform any waiters there there is
* space available.