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mxser: move MSR read to mxser_check_modem_status()

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The MSR read is currently performed on both places where
mxser_check_modem_status() is called. So move it there to avoid code
duplication.

Rename the variable to msr while we move it, to actually see what
"status" we are testing.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20211118073125.12283-5-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2021-11-18 08:31:10 +01:00 committed by Greg Kroah-Hartman
parent 274ab58dc2
commit 30f6027fe4
1 changed files with 25 additions and 21 deletions
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46
drivers/tty/mxser.c
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@ -683,27 +683,34 @@ static void mxser_change_speed(struct tty_struct *tty, struct ktermios *old_term
outb(cval, info->ioaddr + UART_LCR);
}
static void mxser_check_modem_status(struct tty_struct *tty,
struct mxser_port *port, int status)
static u8 mxser_check_modem_status(struct tty_struct *tty,
struct mxser_port *port)
{
u8 msr = inb(port->ioaddr + UART_MSR);
if (!(msr & UART_MSR_ANY_DELTA))
return msr;
/* update input line counters */
if (status & UART_MSR_TERI)
if (msr & UART_MSR_TERI)
port->icount.rng++;
if (status & UART_MSR_DDSR)
if (msr & UART_MSR_DDSR)
port->icount.dsr++;
if (status & UART_MSR_DDCD)
if (msr & UART_MSR_DDCD)
port->icount.dcd++;
if (status & UART_MSR_DCTS)
if (msr & UART_MSR_DCTS)
port->icount.cts++;
wake_up_interruptible(&port->port.delta_msr_wait);
if (tty_port_check_carrier(&port->port) && (status & UART_MSR_DDCD)) {
if (status & UART_MSR_DCD)
if (tty_port_check_carrier(&port->port) && (msr & UART_MSR_DDCD)) {
if (msr & UART_MSR_DCD)
wake_up_interruptible(&port->port.open_wait);
}
if (tty_port_cts_enabled(&port->port))
mxser_handle_cts(tty, port, status);
mxser_handle_cts(tty, port, msr);
return msr;
}
static void mxser_disable_and_clear_FIFO(struct mxser_port *info)
@ -1135,25 +1142,24 @@ static int mxser_get_lsr_info(struct mxser_port *info,
static int mxser_tiocmget(struct tty_struct *tty)
{
struct mxser_port *info = tty->driver_data;
unsigned char control, status;
unsigned char control;
unsigned long flags;
u8 msr;
if (tty_io_error(tty))
return -EIO;
spin_lock_irqsave(&info->slock, flags);
control = info->MCR;
status = inb(info->ioaddr + UART_MSR);
if (status & UART_MSR_ANY_DELTA)
mxser_check_modem_status(tty, info, status);
msr = mxser_check_modem_status(tty, info);
spin_unlock_irqrestore(&info->slock, flags);
return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) |
((msr & UART_MSR_RI) ? TIOCM_RNG : 0) |
((msr & UART_MSR_DSR) ? TIOCM_DSR : 0) |
((msr & UART_MSR_CTS) ? TIOCM_CTS : 0);
}
static int mxser_tiocmset(struct tty_struct *tty,
@ -1656,7 +1662,7 @@ static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port
static bool mxser_port_isr(struct mxser_port *port)
{
struct tty_struct *tty;
u8 iir, msr, status;
u8 iir, status;
bool error = false;
iir = inb(port->ioaddr + UART_IIR);
@ -1689,9 +1695,7 @@ static bool mxser_port_isr(struct mxser_port *port)
status = mxser_receive_chars(tty, port, status);
}
msr = inb(port->ioaddr + UART_MSR);
if (msr & UART_MSR_ANY_DELTA)
mxser_check_modem_status(tty, port, msr);
mxser_check_modem_status(tty, port);
if (port->board->must_hwid) {
if (iir == 0x02 && (status & UART_LSR_THRE))