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tty: isicom: sort out the board init logic

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Split this into two flags - INIT meaning the board is set up and ACTIVE
meaning the board has ports open. Remove the broken HUPCL casing and push
the counts somewhere sensible.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2009-11-30 13:17:30 +00:00 committed by Greg Kroah-Hartman
parent baaa08acb0
commit 6ed847d8ef
2 changed files with 12 additions and 30 deletions
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41
drivers/char/isicom.c
View file

@ -793,21 +793,19 @@ static inline void isicom_setup_board(struct isi_board *bp)
{
int channel;
struct isi_port *port;
unsigned long flags;
spin_lock_irqsave(&bp->card_lock, flags);
if (bp->status & BOARD_ACTIVE) {
spin_unlock_irqrestore(&bp->card_lock, flags);
return;
}
port = bp->ports;
bp->status |= BOARD_ACTIVE;
for (channel = 0; channel < bp->port_count; channel++, port++)
drop_dtr_rts(port);
bp->count++;
spin_unlock_irqrestore(&bp->card_lock, flags);
if (!(bp->status & BOARD_INIT)) {
port = bp->ports;
for (channel = 0; channel < bp->port_count; channel++, port++)
drop_dtr_rts(port);
}
bp->status |= BOARD_ACTIVE | BOARD_INIT;
}
/* Activate and thus setup board are protected from races against shutdown
by the tty_port mutex */
static int isicom_activate(struct tty_port *tport, struct tty_struct *tty)
{
struct isi_port *port = container_of(tport, struct isi_port, port);
@ -884,19 +882,10 @@ static int isicom_open(struct tty_struct *tty, struct file *filp)
/* close et all */
static inline void isicom_shutdown_board(struct isi_board *bp)
{
if (bp->status & BOARD_ACTIVE)
bp->status &= ~BOARD_ACTIVE;
}
/* card->lock HAS to be held */
static void isicom_shutdown_port(struct isi_port *port)
{
struct isi_board *card = port->card;
struct tty_struct *tty;
tty = tty_port_tty_get(&port->port);
tty_port_free_xmit_buf(&port->port);
if (--card->count < 0) {
@ -904,17 +893,9 @@ static void isicom_shutdown_port(struct isi_port *port)
card->base, card->count);
card->count = 0;
}
/* last port was closed, shutdown that board too */
if (tty && C_HUPCL(tty)) {
/* FIXME: this logic is bogus - it's the old logic that was
bogus before but it still wants fixing */
if (!card->count) {
if (card->status & BOARD_ACTIVE)
card->status &= ~BOARD_ACTIVE;
}
}
tty_kref_put(tty);
if (!card->count)
card->status &= BOARD_ACTIVE;
}
static void isicom_flush_buffer(struct tty_struct *tty)

1
include/linux/isicom.h
View file

@ -67,6 +67,7 @@
#define FIRMWARE_LOADED 0x0001
#define BOARD_ACTIVE 0x0002
#define BOARD_INIT 0x0004
/* isi_port status bitmap */