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Eliminate an unnecessary calculation in the serial RX flow control logic

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This commit is contained in:
Gregory Nutt 2014-12-27 08:00:48 -06:00
parent df1f9fad03
commit 2fadd0da4b
1 changed files with 2 additions and 2 deletions
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4
drivers/serial/serialirq.c
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@ -166,6 +166,7 @@ void uart_recvchars(FAR uart_dev_t *dev)
char ch; char ch;
#ifdef CONFIG_SERIAL_IFLOWCONTROL #ifdef CONFIG_SERIAL_IFLOWCONTROL
#ifdef CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS
unsigned int nbuffered; unsigned int nbuffered;
/* How many bytes are buffered */ /* How many bytes are buffered */
@ -179,7 +180,6 @@ void uart_recvchars(FAR uart_dev_t *dev)
nbuffered = buf->size - buf->tail + buf->head; nbuffered = buf->size - buf->tail + buf->head;
} }
#ifdef CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS
/* Is the level now above the watermark level that we need to report? */ /* Is the level now above the watermark level that we need to report? */
if (nbuffered >= watermark) if (nbuffered >= watermark)
@ -202,7 +202,7 @@ void uart_recvchars(FAR uart_dev_t *dev)
if (is_full) if (is_full)
{ {
if (uart_rxflowcontrol(dev, nbuffered, true)) if (uart_rxflowcontrol(dev, buf->size, true))
{ {
/* Low-level driver activated RX flow control, exit loop now. */ /* Low-level driver activated RX flow control, exit loop now. */