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mxser: clean up tx handling in mxser_transmit_chars()

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The port->icount.tx is handled in a too complicated manner. Instead of
remembering the original count and subtracting the new one from it,
simply increase tx for each character in the loop. No need for cnt
variable then.

Change also the "X = X & Y" assignment to simpler "X &= Y".

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20211118073125.12283-6-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2021-11-18 08:31:11 +01:00 • committed by Greg Kroah-Hartman
parent 30f6027fe4
commit 3b88dbff1c
1 changed files with 3 additions and 5 deletions
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8
drivers/tty/mxser.c
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@ -1622,7 +1622,7 @@ static u8 mxser_receive_chars(struct tty_struct *tty,
static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
{
int count, cnt;
int count;
if (port->x_char) {
outb(port->x_char, port->ioaddr + UART_TX);
@ -1640,18 +1640,16 @@ static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port
return;
}
cnt = port->xmit_cnt;
count = port->xmit_fifo_size;
do {
outb(port->port.xmit_buf[port->xmit_tail++],
port->ioaddr + UART_TX);
port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
port->xmit_tail &= SERIAL_XMIT_SIZE - 1;
port->icount.tx++;
if (!--port->xmit_cnt)
break;
} while (--count > 0);
port->icount.tx += (cnt - port->xmit_cnt);
if (port->xmit_cnt < WAKEUP_CHARS)
tty_wakeup(tty);