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[PATCH] Char: mxser_new, reverse if-else-paths patch 

This patch was intorduced in mxser to 1.9.1 conversion, but causes endless
sleep in tcdrain userspace call.

Thanks to Sergei Organov <osv@javad.com> for testing and pointing this out.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jiri Slaby 2006-12-08 02:38:30 -08:00 committed by Linus Torvalds
parent cd7ed64e15
commit 925e9c1c08
1 changed files with 7 additions and 20 deletions
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27
drivers/char/mxser_new.c
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@ -1218,12 +1218,7 @@ static int mxser_write_room(struct tty_struct *tty)
static int mxser_chars_in_buffer(struct tty_struct *tty)
{
struct mxser_port *info = tty->driver_data;
int len = info->xmit_cnt;
if (!(inb(info->ioaddr + UART_LSR) & UART_LSR_THRE))
len++;
return len;
return info->xmit_cnt;
}
static void mxser_flush_buffer(struct tty_struct *tty)
@ -1953,7 +1948,7 @@ static void mxser_stoprx(struct tty_struct *tty)
if (info->board->chip_flag) {
info->IER &= ~MOXA_MUST_RECV_ISR;
outb(info->IER, info->ioaddr + UART_IER);
} else if (!(info->flags & ASYNC_CLOSING)) {
} else {
info->x_char = STOP_CHAR(tty);
outb(0, info->ioaddr + UART_IER);
info->IER |= UART_IER_THRI;
@ -1990,7 +1985,7 @@ static void mxser_unthrottle(struct tty_struct *tty)
if (info->board->chip_flag) {
info->IER |= MOXA_MUST_RECV_ISR;
outb(info->IER, info->ioaddr + UART_IER);
} else if (!(info->flags & ASYNC_CLOSING)) {
} else {
info->x_char = START_CHAR(tty);
outb(0, info->ioaddr + UART_IER);
info->IER |= UART_IER_THRI;
@ -2265,10 +2260,8 @@ static void mxser_receive_chars(struct mxser_port *port, int *status)
flag = TTY_OVERRUN;
/* added by casper 1/11/2000 */
port->icount.overrun++;
} else
flags = TTY_BREAK;
} else
flags = 0;
}
}
tty_insert_flip_char(tty, ch, flag);
cnt++;
if (cnt >= recv_room) {
@ -2324,14 +2317,8 @@ static void mxser_transmit_chars(struct mxser_port *port)
if (port->xmit_buf == 0)
goto unlock;
if (port->xmit_cnt == 0) {
if (port->xmit_cnt < WAKEUP_CHARS) { /* XXX what's this for?? */
set_bit(MXSER_EVENT_TXLOW, &port->event);
schedule_work(&port->tqueue);
}
goto unlock;
}
if (port->tty->stopped || (port->tty->hw_stopped &&
if ((port->xmit_cnt <= 0) || port->tty->stopped ||
(port->tty->hw_stopped &&
(port->type != PORT_16550A) &&
(!port->board->chip_flag))) {
port->IER &= ~UART_IER_THRI;