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mxser: extract and dedup CTS handling

Browse source 
CTS is handled on two locations in mxser. Extract the code into
separation function mxser_handle_cts. And call it from the two
locations.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210618061516.662-59-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2021-06-18 08:15:04 +02:00 committed by Greg Kroah-Hartman
parent 8aff64e00f
commit be4866671f
1 changed files with 33 additions and 54 deletions
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87
drivers/tty/mxser.c
View file

@ -506,6 +506,35 @@ static int mxser_set_baud(struct tty_struct *tty, speed_t newspd)
return 0;
}
static void mxser_handle_cts(struct tty_struct *tty, struct mxser_port *info,
u8 msr)
{
bool cts = msr & UART_MSR_CTS;
if (tty->hw_stopped) {
if (cts) {
tty->hw_stopped = 0;
if (info->type != PORT_16550A &&
!info->board->must_hwid) {
outb(info->IER & ~UART_IER_THRI,
info->ioaddr + UART_IER);
info->IER |= UART_IER_THRI;
outb(info->IER, info->ioaddr + UART_IER);
}
tty_wakeup(tty);
}
return;
} else if (cts)
return;
tty->hw_stopped = 1;
if (info->type != PORT_16550A && !info->board->must_hwid) {
info->IER &= ~UART_IER_THRI;
outb(info->IER, info->ioaddr + UART_IER);
}
}
/*
* This routine is called to set the UART divisor registers to match
* the specified baud rate for a serial port.
@ -514,7 +543,6 @@ static void mxser_change_speed(struct tty_struct *tty)
{
struct mxser_port *info = tty->driver_data;
unsigned cflag, cval, fcr;
unsigned char status;
cflag = tty->termios.c_cflag;
@ -585,32 +613,8 @@ static void mxser_change_speed(struct tty_struct *tty)
if ((info->type == PORT_16550A) || (info->board->must_hwid)) {
info->MCR |= UART_MCR_AFE;
} else {
status = inb(info->ioaddr + UART_MSR);
if (tty->hw_stopped) {
if (status & UART_MSR_CTS) {
tty->hw_stopped = 0;
if (info->type != PORT_16550A &&
!info->board->must_hwid) {
outb(info->IER & ~UART_IER_THRI,
info->ioaddr +
UART_IER);
info->IER |= UART_IER_THRI;
outb(info->IER, info->ioaddr +
UART_IER);
}
tty_wakeup(tty);
}
} else {
if (!(status & UART_MSR_CTS)) {
tty->hw_stopped = 1;
if ((info->type != PORT_16550A) &&
(!info->board->must_hwid)) {
info->IER &= ~UART_IER_THRI;
outb(info->IER, info->ioaddr +
UART_IER);
}
}
}
mxser_handle_cts(tty, info,
inb(info->ioaddr + UART_MSR));
}
}
outb(info->MCR, info->ioaddr + UART_MCR);
@ -679,33 +683,8 @@ static void mxser_check_modem_status(struct tty_struct *tty,
wake_up_interruptible(&port->port.open_wait);
}
if (tty_port_cts_enabled(&port->port)) {
if (tty->hw_stopped) {
if (status & UART_MSR_CTS) {
tty->hw_stopped = 0;
if ((port->type != PORT_16550A) &&
(!port->board->must_hwid)) {
outb(port->IER & ~UART_IER_THRI,
port->ioaddr + UART_IER);
port->IER |= UART_IER_THRI;
outb(port->IER, port->ioaddr +
UART_IER);
}
tty_wakeup(tty);
}
} else {
if (!(status & UART_MSR_CTS)) {
tty->hw_stopped = 1;
if (port->type != PORT_16550A &&
!port->board->must_hwid) {
port->IER &= ~UART_IER_THRI;
outb(port->IER, port->ioaddr +
UART_IER);
}
}
}
}
if (tty_port_cts_enabled(&port->port))
mxser_handle_cts(tty, port, status);
}
static int mxser_activate(struct tty_port *port, struct tty_struct *tty)