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tty: refcount the epca driver 

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox 2009-01-02 13:48:04 +00:00 committed by Linus Torvalds
parent d1c815e549
commit 3969ffba71
1 changed files with 15 additions and 12 deletions
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27
drivers/char/epca.c
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@ -175,7 +175,7 @@ static unsigned termios2digi_h(struct channel *ch, unsigned);
static unsigned termios2digi_i(struct channel *ch, unsigned);
static unsigned termios2digi_c(struct channel *ch, unsigned);
static void epcaparam(struct tty_struct *, struct channel *);
static void receive_data(struct channel *);
static void receive_data(struct channel *, struct tty_struct *tty);
static int pc_ioctl(struct tty_struct *, struct file *,
unsigned int, unsigned long);
static int info_ioctl(struct tty_struct *, struct file *,
@ -473,7 +473,7 @@ static void pc_close(struct tty_struct *tty, struct file *filp)
spin_lock_irqsave(&port->lock, flags);
tty->closing = 0;
ch->event = 0;
port->tty = NULL;
tty_port_tty_set(port, NULL);
spin_unlock_irqrestore(&port->lock, flags);
if (port->blocked_open) {
@ -1029,8 +1029,11 @@ static void __exit epca_module_exit(void)
}
ch = card_ptr[crd];
for (count = 0; count < bd->numports; count++, ch++) {
if (ch && ch->port.tty)
tty_hangup(ch->port.tty);
struct tty_struct *tty = tty_port_tty_get(&ch->port);
if (tty) {
tty_hangup(tty);
tty_kref_put(tty);
}
}
}
pci_unregister_driver(&epca_driver);
@ -1441,7 +1444,7 @@ static void post_fep_init(unsigned int crd)
ch->boardnum = crd;
ch->channelnum = i;
ch->magic = EPCA_MAGIC;
ch->port.tty = NULL;
tty_port_tty_set(&ch->port, NULL);
if (shrinkmem) {
fepcmd(ch, SETBUFFER, 32, 0, 0, 0);
@ -1635,8 +1638,9 @@ static void doevent(int crd)
if (bc == NULL)
goto next;
tty = tty_port_tty_get(&ch->port);
if (event & DATA_IND) { /* Begin DATA_IND */
receive_data(ch);
receive_data(ch, tty);
assertgwinon(ch);
} /* End DATA_IND */
/* else *//* Fix for DCD transition missed bug */
@ -1651,7 +1655,6 @@ static void doevent(int crd)
pc_sched_event(ch, EPCA_EVENT_HANGUP);
}
}
tty = ch->port.tty;
if (tty) {
if (event & BREAK_IND) {
/* A break has been indicated */
@ -1671,6 +1674,7 @@ static void doevent(int crd)
tty_wakeup(tty);
}
}
tty_kref_put(tty);
}
next:
globalwinon(ch);
@ -1965,11 +1969,10 @@ static void epcaparam(struct tty_struct *tty, struct channel *ch)
}
/* Caller holds lock */
static void receive_data(struct channel *ch)
static void receive_data(struct channel *ch, struct tty_struct *tty)
{
unchar *rptr;
struct ktermios *ts = NULL;
struct tty_struct *tty;
struct board_chan __iomem *bc;
int dataToRead, wrapgap, bytesAvailable;
unsigned int tail, head;
@ -1982,7 +1985,6 @@ static void receive_data(struct channel *ch)
globalwinon(ch);
if (ch->statusflags & RXSTOPPED)
return;
tty = ch->port.tty;
if (tty)
ts = tty->termios;
bc = ch->brdchan;
@ -2042,7 +2044,7 @@ static void receive_data(struct channel *ch)
globalwinon(ch);
writew(tail, &bc->rout);
/* Must be called with global data */
tty_schedule_flip(ch->port.tty);
tty_schedule_flip(tty);
}
static int info_ioctl(struct tty_struct *tty, struct file *file,
@ -2365,7 +2367,7 @@ static void do_softint(struct work_struct *work)
struct channel *ch = container_of(work, struct channel, tqueue);
/* Called in response to a modem change event */
if (ch && ch->magic == EPCA_MAGIC) {
struct tty_struct *tty = ch->port.tty;
struct tty_struct *tty = tty_port_tty_get(&ch->port);;
if (tty && tty->driver_data) {
if (test_and_clear_bit(EPCA_EVENT_HANGUP, &ch->event)) {
@ -2374,6 +2376,7 @@ static void do_softint(struct work_struct *work)
ch->port.flags &= ~ASYNC_NORMAL_ACTIVE;
}
}
tty_kref_put(tty);
}
}