[PATCH 44/75] tty: Introduce some close helpers for ports

Alan Cox
2009-01-02T13:46:42Z

From: Alan Cox <alan@redhat.com>

Again this is a lot of common code we can unify

Signed-off-by: Alan Cox <alan@redhat.com>
---

drivers/char/isicom.c | 66 ++++++-------------------------------
drivers/char/istallion.c | 78 ++++++++++++++++----------------------------
drivers/char/mxser.c | 56 +++++---------------------------
drivers/char/riscom8.c | 49 +++-------------------------
drivers/char/stallion.c | 39 ++--------------------
drivers/char/synclink.c | 58 ++-------------------------------
drivers/char/synclink_gt.c | 51 +----------------------------
drivers/char/synclinkmp.c | 58 ++-------------------------------
drivers/char/tty_port.c | 58 +++++++++++++++++++++++++++++++++
include/linux/istallion.h | 1 -
include/linux/tty.h | 3 ++
11 files changed, 126 insertions(+), 391 deletions(-)

diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index bac55cf..24aa6e8 100644
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -945,76 +945,30 @@ static void isicom_flush_buffer(struct tty_struct *tty)

static void isicom_close(struct tty_struct *tty, struct file *filp)
{
- struct isi_port *port = tty->driver_data;
+ struct isi_port *ip = tty->driver_data;
+ struct tty_port *port = &ip->port;
struct isi_board *card;
unsigned long flags;

- if (!port)
- return;
- card = port->card;
- if (isicom_paranoia_check(port, tty->name, "isicom_close"))
- return;
-
- pr_dbg("Close start!!!.\n");
-
- spin_lock_irqsave(&port->port.lock, flags);
- if (tty_hung_up_p(filp)) {
- spin_unlock_irqrestore(&port->port.lock, flags);
- return;
- }
-
- if (tty->count == 1 && port->port.count != 1) {
- printk(KERN_WARNING "ISICOM:(0x%lx) isicom_close: bad port "
- "count tty->count = 1 port count = %d.\n",
- card->base, port->port.count);
- port->port.count = 1;
- }
- if (--port->port.count < 0) {
- printk(KERN_WARNING "ISICOM:(0x%lx) isicom_close: bad port "
- "count for channel%d = %d", card->base, port->channel,
- port->port.count);
- port->port.count = 0;
- }
+ BUG_ON(!ip);

- if (port->port.count) {
- spin_unlock_irqrestore(&port->port.lock, flags);
+ card = ip->card;
+ if (isicom_paranoia_check(ip, tty->name, "isicom_close"))
return;
- }
- port->port.flags |= ASYNC_CLOSING;
- tty->closing = 1;
- spin_unlock_irqrestore(&port->port.lock, flags);

- if (port->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
- tty_wait_until_sent(tty, port->port.closing_wait);
/* indicate to the card that no more data can be received
on this port */
spin_lock_irqsave(&card->card_lock, flags);
- if (port->port.flags & ASYNC_INITIALIZED) {
- card->port_status &= ~(1 << port->channel);
+ if (port->flags & ASYNC_INITIALIZED) {
+ card->port_status &= ~(1 << ip->channel);
outw(card->port_status, card->base + 0x02);
}
- isicom_shutdown_port(port);
+ isicom_shutdown_port(ip);
spin_unlock_irqrestore(&card->card_lock, flags);

isicom_flush_buffer(tty);
- tty_ldisc_flush(tty);
-
- spin_lock_irqsave(&port->port.lock, flags);
- tty->closing = 0;
-
- if (port->port.blocked_open) {
- spin_unlock_irqrestore(&port->port.lock, flags);
- if (port->port.close_delay) {
- pr_dbg("scheduling until time out.\n");
- msleep_interruptible(
- jiffies_to_msecs(port->port.close_delay));
- }
- spin_lock_irqsave(&port->port.lock, flags);
- wake_up_interruptible(&port->port.open_wait);
- }
- port->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
- wake_up_interruptible(&port->port.close_wait);
- spin_unlock_irqrestore(&port->port.lock, flags);
+
+ tty_port_close_end(port, tty);
}

/* write et all */
diff --git a/drivers/char/istallion.c b/drivers/char/istallion.c
index 4c69ab9..5c3dc6b 100644
--- a/drivers/char/istallion.c
+++ b/drivers/char/istallion.c
@@ -767,7 +767,7 @@ static int stli_parsebrd(struct stlconf *confp, char **argp)
break;
}
if (i == ARRAY_SIZE(stli_brdstr)) {
- printk("STALLION: unknown board name, %s?\n", argp[0]);
+ printk(KERN_WARNING "istallion: unknown board name, %s?\n", argp[0]);
return 0;
}

@@ -855,21 +855,8 @@ static void stli_close(struct tty_struct *tty, struct file *filp)
return;
port = &portp->port;

- spin_lock_irqsave(&port->lock, flags);
- if (tty_hung_up_p(filp)) {
- spin_unlock_irqrestore(&port->lock, flags);
- return;
- }
- if (tty->count == 1 && port->count != 1)
- port->count = 1;
- if (port->count-- > 1) {
- spin_unlock_irqrestore(&port->lock, flags);
+ if (tty_port_close_start(port, tty, filp) == 0)
return;
- }
-
- port->flags |= ASYNC_CLOSING;
- tty->closing = 1;
- spin_unlock_irqrestore(&port->lock, flags);

/*
* May want to wait for data to drain before closing. The BUSY flag
@@ -882,6 +869,8 @@ static void stli_close(struct tty_struct *tty, struct file *filp)
stli_flushchars(tty);
spin_unlock_irqrestore(&stli_lock, flags);

+ /* We end up doing this twice for the moment. This needs looking at
+ eventually. Note we still use portp->closing_wait as a result */
if (portp->closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, portp->closing_wait);

@@ -905,17 +894,8 @@ static void stli_close(struct tty_struct *tty, struct file *filp)
set_bit(ST_DOFLUSHRX, &portp->state);
stli_flushbuffer(tty);

- tty->closing = 0;
- tty_port_tty_set(&portp->port, NULL);
-
- if (port->blocked_open) {
- if (portp->close_delay)
- msleep_interruptible(jiffies_to_msecs(portp->close_delay));
- wake_up_interruptible(&port->open_wait);
- }
-
- port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
- wake_up_interruptible(&port->close_wait);
+ tty_port_close_end(port, tty);
+ tty_port_tty_set(port, NULL);
}

/*****************************************************************************/
@@ -1482,7 +1462,7 @@ static int stli_getserial(struct stliport *portp, struct serial_struct __user *s
sio.irq = 0;
sio.flags = portp->port.flags;
sio.baud_base = portp->baud_base;
- sio.close_delay = portp->close_delay;
+ sio.close_delay = portp->port.close_delay;
sio.closing_wait = portp->closing_wait;
sio.custom_divisor = portp->custom_divisor;
sio.xmit_fifo_size = 0;
@@ -1514,7 +1494,7 @@ static int stli_setserial(struct tty_struct *tty, struct serial_struct __user *s
return -EFAULT;
if (!capable(CAP_SYS_ADMIN)) {
if ((sio.baud_base != portp->baud_base) ||
- (sio.close_delay != portp->close_delay) ||
+ (sio.close_delay != portp->port.close_delay) ||
((sio.flags & ~ASYNC_USR_MASK) !=
(portp->port.flags & ~ASYNC_USR_MASK)))
return -EPERM;
@@ -1523,7 +1503,7 @@ static int stli_setserial(struct tty_struct *tty, struct serial_struct __user *s
portp->port.flags = (portp->port.flags & ~ASYNC_USR_MASK) |
(sio.flags & ASYNC_USR_MASK);
portp->baud_base = sio.baud_base;
- portp->close_delay = sio.close_delay;
+ portp->port.close_delay = sio.close_delay;
portp->closing_wait = sio.closing_wait;
portp->custom_divisor = sio.custom_divisor;

@@ -2065,7 +2045,7 @@ static void __stli_sendcmd(struct stlibrd *brdp, struct stliport *portp, unsigne
unsigned char __iomem *bits;

if (test_bit(ST_CMDING, &portp->state)) {
- printk(KERN_ERR "STALLION: command already busy, cmd=%x!\n",
+ printk(KERN_ERR "istallion: command already busy, cmd=%x!\n",
(int) cmd);
return;
}
@@ -2625,7 +2605,7 @@ static int stli_initports(struct stlibrd *brdp)
for (i = 0, panelnr = 0, panelport = 0; (i < brdp->nrports); i++) {
portp = kzalloc(sizeof(struct stliport), GFP_KERNEL);
if (!portp) {
- printk("STALLION: failed to allocate port structure\n");
+ printk(KERN_WARNING "istallion: failed to allocate port structure\n");
continue;
}
tty_port_init(&portp->port);
@@ -2635,7 +2615,7 @@ static int stli_initports(struct stlibrd *brdp)
portp->brdnr = brdp->brdnr;
portp->panelnr = panelnr;
portp->baud_base = STL_BAUDBASE;
- portp->close_delay = STL_CLOSEDELAY;
+ portp->port.close_delay = STL_CLOSEDELAY;
portp->closing_wait = 30 * HZ;
init_waitqueue_head(&portp->port.open_wait);
init_waitqueue_head(&portp->port.close_wait);
@@ -2692,7 +2672,7 @@ static void __iomem *stli_ecpgetmemptr(struct stlibrd *brdp, unsigned long offse
unsigned char val;

if (offset > brdp->memsize) {
- printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
+ printk(KERN_ERR "istallion: shared memory pointer=%x out of "
"range at line=%d(%d), brd=%d\n",
(int) offset, line, __LINE__, brdp->brdnr);
ptr = NULL;
@@ -2766,7 +2746,7 @@ static void __iomem *stli_ecpeigetmemptr(struct stlibrd *brdp, unsigned long off
unsigned char val;

if (offset > brdp->memsize) {
- printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
+ printk(KERN_ERR "istallion: shared memory pointer=%x out of "
"range at line=%d(%d), brd=%d\n",
(int) offset, line, __LINE__, brdp->brdnr);
ptr = NULL;
@@ -2818,7 +2798,7 @@ static void __iomem *stli_ecpmcgetmemptr(struct stlibrd *brdp, unsigned long off
unsigned char val;

if (offset > brdp->memsize) {
- printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
+ printk(KERN_ERR "istallion: shared memory pointer=%x out of "
"range at line=%d(%d), brd=%d\n",
(int) offset, line, __LINE__, brdp->brdnr);
ptr = NULL;
@@ -2863,7 +2843,7 @@ static void __iomem *stli_ecppcigetmemptr(struct stlibrd *brdp, unsigned long of
unsigned char val;

if (offset > brdp->memsize) {
- printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
+ printk(KERN_ERR "istallion: shared memory pointer=%x out of "
"range at line=%d(%d), board=%d\n",
(int) offset, line, __LINE__, brdp->brdnr);
ptr = NULL;
@@ -2928,7 +2908,7 @@ static void __iomem *stli_onbgetmemptr(struct stlibrd *brdp, unsigned long offse
void __iomem *ptr;

if (offset > brdp->memsize) {
- printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
+ printk(KERN_ERR "istallion: shared memory pointer=%x out of "
"range at line=%d(%d), brd=%d\n",
(int) offset, line, __LINE__, brdp->brdnr);
ptr = NULL;
@@ -2994,7 +2974,7 @@ static void __iomem *stli_onbegetmemptr(struct stlibrd *brdp, unsigned long offs
unsigned char val;

if (offset > brdp->memsize) {
- printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
+ printk(KERN_ERR "istallion: shared memory pointer=%x out of "
"range at line=%d(%d), brd=%d\n",
(int) offset, line, __LINE__, brdp->brdnr);
ptr = NULL;
@@ -3433,7 +3413,7 @@ static int stli_startbrd(struct stlibrd *brdp)
#endif

if (nrdevs < (brdp->nrports + 1)) {
- printk(KERN_ERR "STALLION: slave failed to allocate memory for "
+ printk(KERN_ERR "istallion: slave failed to allocate memory for "
"all devices, devices=%d\n", nrdevs);
brdp->nrports = nrdevs - 1;
}
@@ -3443,13 +3423,13 @@ static int stli_startbrd(struct stlibrd *brdp)
brdp->bitsize = (nrdevs + 7) / 8;
memoff = readl(&hdrp->memp);
if (memoff > brdp->memsize) {
- printk(KERN_ERR "STALLION: corrupted shared memory region?\n");
+ printk(KERN_ERR "istallion: corrupted shared memory region?\n");
rc = -EIO;
goto stli_donestartup;
}
memp = (cdkmem_t __iomem *) EBRDGETMEMPTR(brdp, memoff);
if (readw(&memp->dtype) != TYP_ASYNCTRL) {
- printk(KERN_ERR "STALLION: no slave control device found\n");
+ printk(KERN_ERR "istallion: no slave control device found\n");
goto stli_donestartup;
}
memp++;
@@ -3534,7 +3514,7 @@ static int __devinit stli_brdinit(struct stlibrd *brdp)
retval = stli_initonb(brdp);
break;
default:
- printk(KERN_ERR "STALLION: board=%d is unknown board "
+ printk(KERN_ERR "istallion: board=%d is unknown board "
"type=%d\n", brdp->brdnr, brdp->brdtype);
retval = -ENODEV;
}
@@ -3543,7 +3523,7 @@ static int __devinit stli_brdinit(struct stlibrd *brdp)
return retval;

stli_initports(brdp);
- printk(KERN_INFO "STALLION: %s found, board=%d io=%x mem=%x "
+ printk(KERN_INFO "istallion: %s found, board=%d io=%x mem=%x "
"nrpanels=%d nrports=%d\n", stli_brdnames[brdp->brdtype],
brdp->brdnr, brdp->iobase, (int) brdp->memaddr,
brdp->nrpanels, brdp->nrports);
@@ -3637,7 +3617,7 @@ static int stli_eisamemprobe(struct stlibrd *brdp)
if (! foundit) {
brdp->memaddr = 0;
brdp->membase = NULL;
- printk(KERN_ERR "STALLION: failed to probe shared memory "
+ printk(KERN_ERR "istallion: failed to probe shared memory "
"region for %s in EISA slot=%d\n",
stli_brdnames[brdp->brdtype], (brdp->iobase >> 12));
return -ENODEV;
@@ -3782,7 +3762,7 @@ static int __devinit stli_pciprobe(struct pci_dev *pdev,
mutex_lock(&stli_brdslock);
brdnr = stli_getbrdnr();
if (brdnr < 0) {
- printk(KERN_INFO "STALLION: too many boards found, "
+ printk(KERN_INFO "istallion: too many boards found, "
"maximum supported %d\n", STL_MAXBRDS);
mutex_unlock(&stli_brdslock);
retval = -EIO;
@@ -3854,7 +3834,7 @@ static struct stlibrd *stli_allocbrd(void)

brdp = kzalloc(sizeof(struct stlibrd), GFP_KERNEL);
if (!brdp) {
- printk(KERN_ERR "STALLION: failed to allocate memory "
+ printk(KERN_ERR "istallion: failed to allocate memory "
"(size=%Zd)\n", sizeof(struct stlibrd));
return NULL;
}
@@ -4493,7 +4473,7 @@ static int __init istallion_module_init(void)

stli_txcookbuf = kmalloc(STLI_TXBUFSIZE, GFP_KERNEL);
if (!stli_txcookbuf) {
- printk(KERN_ERR "STALLION: failed to allocate memory "
+ printk(KERN_ERR "istallion: failed to allocate memory "
"(size=%d)\n", STLI_TXBUFSIZE);
retval = -ENOMEM;
goto err;
@@ -4518,7 +4498,7 @@ static int __init istallion_module_init(void)

retval = tty_register_driver(stli_serial);
if (retval) {
- printk(KERN_ERR "STALLION: failed to register serial driver\n");
+ printk(KERN_ERR "istallion: failed to register serial driver\n");
goto err_ttyput;
}

@@ -4532,7 +4512,7 @@ static int __init istallion_module_init(void)
*/
retval = register_chrdev(STL_SIOMEMMAJOR, "staliomem", &stli_fsiomem);
if (retval) {
- printk(KERN_ERR "STALLION: failed to register serial memory "
+ printk(KERN_ERR "istallion: failed to register serial memory "
"device\n");
goto err_deinit;
}
diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c
index 08ba6eb..402c9f2 100644
--- a/drivers/char/mxser.c
+++ b/drivers/char/mxser.c
@@ -1080,58 +1080,27 @@ static void mxser_flush_buffer(struct tty_struct *tty)
static void mxser_close(struct tty_struct *tty, struct file *filp)
{
struct mxser_port *info = tty->driver_data;
+ struct tty_port *port = &info->port;

unsigned long timeout;
- unsigned long flags;

if (tty->index == MXSER_PORTS)
return;
if (!info)
return;

- spin_lock_irqsave(&info->port.lock, flags);
-
- if (tty_hung_up_p(filp)) {
- spin_unlock_irqrestore(&info->port.lock, flags);
- return;
- }
- if ((tty->count == 1) && (info->port.count != 1)) {
- /*
- * Uh, oh. tty->count is 1, which means that the tty
- * structure will be freed. Info->port.count should always
- * be one in these conditions. If it's greater than
- * one, we've got real problems, since it means the
- * serial port won't be shutdown.
- */
- printk(KERN_ERR "mxser_close: bad serial port count; "
- "tty->count is 1, info->port.count is %d\n", info->port.count);
- info->port.count = 1;
- }
- if (--info->port.count < 0) {
- printk(KERN_ERR "mxser_close: bad serial port count for "
- "ttys%d: %d\n", tty->index, info->port.count);
- info->port.count = 0;
- }
- if (info->port.count) {
- spin_unlock_irqrestore(&info->port.lock, flags);
+ if (tty_port_close_start(port, tty, filp) == 0)
return;
- }
- info->port.flags |= ASYNC_CLOSING;
- spin_unlock_irqrestore(&info->port.lock, flags);
+
/*
* Save the termios structure, since this port may have
* separate termios for callout and dialin.
+ *
+ * FIXME: Can this go ?
*/
if (info->port.flags & ASYNC_NORMAL_ACTIVE)
info->normal_termios = *tty->termios;
/*
- * Now we wait for the transmit buffer to clear; and we notify
- * the line discipline to only process XON/XOFF characters.
- */
- tty->closing = 1;
- if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
- tty_wait_until_sent(tty, info->port.closing_wait);
- /*
* At this point we stop accepting input. To do this, we
* disable the receive line status interrupts, and tell the
* interrupt driver to stop checking the data ready bit in the
@@ -1156,19 +1125,12 @@ static void mxser_close(struct tty_struct *tty, struct file *filp)
}
}
mxser_shutdown(tty);
-
mxser_flush_buffer(tty);
- tty_ldisc_flush(tty);
-
- tty->closing = 0;
- tty_port_tty_set(&info->port, NULL);
- if (info->port.blocked_open) {
- if (info->port.close_delay)
- schedule_timeout_interruptible(info->port.close_delay);
- wake_up_interruptible(&info->port.open_wait);
- }

- info->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
+ /* Right now the tty_port set is done outside of the close_end helper
+ as we don't yet have everyone using refcounts */
+ tty_port_close_end(port, tty);
+ tty_port_tty_set(port, NULL);
}

static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
diff --git a/drivers/char/riscom8.c b/drivers/char/riscom8.c
index af34c20..9ac5feb 100644
--- a/drivers/char/riscom8.c
+++ b/drivers/char/riscom8.c
@@ -929,35 +929,11 @@ static void rc_close(struct tty_struct *tty, struct file *filp)
if (!port || rc_paranoia_check(port, tty->name, "close"))
return;

- spin_lock_irqsave(&port->port.lock, flags);
-
- if (tty_hung_up_p(filp))
- goto out;
-
bp = port_Board(port);
- if ((tty->count == 1) && (port->port.count != 1)) {
- printk(KERN_INFO "rc%d: rc_close: bad port count;"
- " tty->count is 1, port count is %d\n",
- board_No(bp), port->port.count);
- port->port.count = 1;
- }
- if (--port->port.count < 0) {
- printk(KERN_INFO "rc%d: rc_close: bad port count "
- "for tty%d: %d\n",
- board_No(bp), port_No(port), port->port.count);
- port->port.count = 0;
- }
- if (port->port.count)
- goto out;
- port->port.flags |= ASYNC_CLOSING;
- /*
- * Now we wait for the transmit buffer to clear; and we notify
- * the line discipline to only process XON/XOFF characters.
- */
- tty->closing = 1;
- spin_unlock_irqrestore(&port->port.lock, flags);
- if (port->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
- tty_wait_until_sent(tty, port->port.closing_wait);
+
+ if (tty_port_close_start(&port->port, tty, filp) == 0)
+ return;
+
/*
* At this point we stop accepting input. To do this, we
* disable the receive line status interrupts, and tell the
@@ -989,23 +965,8 @@ static void rc_close(struct tty_struct *tty, struct file *filp)
rc_shutdown_port(tty, bp, port);
rc_flush_buffer(tty);
spin_unlock_irqrestore(&riscom_lock, flags);
- tty_ldisc_flush(tty);

- spin_lock_irqsave(&port->port.lock, flags);
- tty->closing = 0;
- port->port.tty = NULL;
- if (port->port.blocked_open) {
- spin_unlock_irqrestore(&port->port.lock, flags);
- if (port->port.close_delay)
- msleep_interruptible(jiffies_to_msecs(port->port.close_delay));
- wake_up_interruptible(&port->port.open_wait);
- spin_lock_irqsave(&port->port.lock, flags);
- }
- port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
- wake_up_interruptible(&port->port.close_wait);
-
-out:
- spin_unlock_irqrestore(&riscom_lock, flags);
+ tty_port_close_end(&port->port, tty);
}

static int rc_write(struct tty_struct *tty,
diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c
index 77eef61..e1e0dd8 100644
--- a/drivers/char/stallion.c
+++ b/drivers/char/stallion.c
@@ -833,40 +833,20 @@ static void stl_close(struct tty_struct *tty, struct file *filp)
pr_debug("stl_close(tty=%p,filp=%p)\n", tty, filp);

portp = tty->driver_data;
- if (portp == NULL)
- return;
+ BUG_ON(portp == NULL);
+
port = &portp->port;

- spin_lock_irqsave(&port->lock, flags);
- if (tty_hung_up_p(filp)) {
- spin_unlock_irqrestore(&port->lock, flags);
+ if (tty_port_close_start(port, tty, filp) == 0)
return;
- }
- if (tty->count == 1 && port->count != 1)
- port->count = 1;
- if (port->count-- > 1) {
- spin_unlock_irqrestore(&port->lock, flags);
- return;
- }
-
- port->count = 0;
- port->flags |= ASYNC_CLOSING;
-
/*
* May want to wait for any data to drain before closing. The BUSY
* flag keeps track of whether we are still sending or not - it is
* very accurate for the cd1400, not quite so for the sc26198.
* (The sc26198 has no "end-of-data" interrupt only empty FIFO)
*/
- tty->closing = 1;
-
- spin_unlock_irqrestore(&port->lock, flags);
-
- if (portp->closing_wait != ASYNC_CLOSING_WAIT_NONE)
- tty_wait_until_sent(tty, portp->closing_wait);
stl_waituntilsent(tty, (HZ / 2));

-
spin_lock_irqsave(&port->lock, flags);
portp->port.flags &= ~ASYNC_INITIALIZED;
spin_unlock_irqrestore(&port->lock, flags);
@@ -883,20 +863,9 @@ static void stl_close(struct tty_struct *tty, struct file *filp)
portp->tx.head = NULL;
portp->tx.tail = NULL;
}
- set_bit(TTY_IO_ERROR, &tty->flags);
- tty_ldisc_flush(tty);

- tty->closing = 0;
+ tty_port_close_end(port, tty);
tty_port_tty_set(port, NULL);
-
- if (port->blocked_open) {
- if (portp->close_delay)
- msleep_interruptible(jiffies_to_msecs(portp->close_delay));
- wake_up_interruptible(&portp->port.open_wait);
- }
-
- portp->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
- wake_up_interruptible(&port->close_wait);
}

/*****************************************************************************/
diff --git a/drivers/char/synclink.c b/drivers/char/synclink.c
index 0ded4ed..fbd5a5c 100644
--- a/drivers/char/synclink.c
+++ b/drivers/char/synclink.c
@@ -3104,70 +3104,18 @@ static void mgsl_close(struct tty_struct *tty, struct file * filp)
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
__FILE__,__LINE__, info->device_name, info->port.count);
-
- if (!info->port.count)
- return;

- if (tty_hung_up_p(filp))
+ if (tty_port_close_start(&info->port, tty, filp) == 0)
goto cleanup;

- if ((tty->count == 1) && (info->port.count != 1)) {
- /*
- * tty->count is 1 and the tty structure will be freed.
- * info->port.count should be one in this case.
- * if it's not, correct it so that the port is shutdown.
- */
- printk("mgsl_close: bad refcount; tty->count is 1, "
- "info->port.count is %d\n", info->port.count);
- info->port.count = 1;
- }
-
- info->port.count--;
-
- /* if at least one open remaining, leave hardware active */
- if (info->port.count)
- goto cleanup;
-
- info->port.flags |= ASYNC_CLOSING;
-
- /* set tty->closing to notify line discipline to
- * only process XON/XOFF characters. Only the N_TTY
- * discipline appears to use this (ppp does not).
- */
- tty->closing = 1;
-
- /* wait for transmit data to clear all layers */
-
- if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) {
- if (debug_level >= DEBUG_LEVEL_INFO)
- printk("%s(%d):mgsl_close(%s) calling tty_wait_until_sent\n",
- __FILE__,__LINE__, info->device_name );
- tty_wait_until_sent(tty, info->port.closing_wait);
- }
-
if (info->port.flags & ASYNC_INITIALIZED)
mgsl_wait_until_sent(tty, info->timeout);
-
mgsl_flush_buffer(tty);
-
tty_ldisc_flush(tty);
-
shutdown(info);
-
- tty->closing = 0;
+
+ tty_port_close_end(&info->port, tty);
info->port.tty = NULL;
-
- if (info->port.blocked_open) {
- if (info->port.close_delay) {
- msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
- }
- wake_up_interruptible(&info->port.open_wait);
- }
-
- info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
-
- wake_up_interruptible(&info->port.close_wait);
-
cleanup:
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
diff --git a/drivers/char/synclink_gt.c b/drivers/char/synclink_gt.c
index 625c9bd..53544e2 100644
--- a/drivers/char/synclink_gt.c
+++ b/drivers/char/synclink_gt.c
@@ -720,44 +720,9 @@ static void close(struct tty_struct *tty, struct file *filp)
return;
DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));

- if (!info->port.count)
- return;
-
- if (tty_hung_up_p(filp))
+ if (tty_port_close_start(&info->port, tty, filp) == 0)
goto cleanup;

- if ((tty->count == 1) && (info->port.count != 1)) {
- /*
- * tty->count is 1 and the tty structure will be freed.
- * info->port.count should be one in this case.
- * if it's not, correct it so that the port is shutdown.
- */
- DBGERR(("%s close: bad refcount; tty->count=1, "
- "info->port.count=%d\n", info->device_name, info->port.count));
- info->port.count = 1;
- }
-
- info->port.count--;
-
- /* if at least one open remaining, leave hardware active */
- if (info->port.count)
- goto cleanup;
-
- info->port.flags |= ASYNC_CLOSING;
-
- /* set tty->closing to notify line discipline to
- * only process XON/XOFF characters. Only the N_TTY
- * discipline appears to use this (ppp does not).
- */
- tty->closing = 1;
-
- /* wait for transmit data to clear all layers */
-
- if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) {
- DBGINFO(("%s call tty_wait_until_sent\n", info->device_name));
- tty_wait_until_sent(tty, info->port.closing_wait);
- }
-
if (info->port.flags & ASYNC_INITIALIZED)
wait_until_sent(tty, info->timeout);
flush_buffer(tty);
@@ -765,20 +730,8 @@ static void close(struct tty_struct *tty, struct file *filp)

shutdown(info);

- tty->closing = 0;
+ tty_port_close_end(&info->port, tty);
info->port.tty = NULL;
-
- if (info->port.blocked_open) {
- if (info->port.close_delay) {
- msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
- }
- wake_up_interruptible(&info->port.open_wait);
- }
-
- info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
-
- wake_up_interruptible(&info->port.close_wait);
-
cleanup:
DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
}
diff --git a/drivers/char/synclinkmp.c b/drivers/char/synclinkmp.c
index 1f5c21e..2aac55b 100644
--- a/drivers/char/synclinkmp.c
+++ b/drivers/char/synclinkmp.c
@@ -810,70 +810,18 @@ static void close(struct tty_struct *tty, struct file *filp)
printk("%s(%d):%s close() entry, count=%d\n",
__FILE__,__LINE__, info->device_name, info->port.count);

- if (!info->port.count)
- return;
-
- if (tty_hung_up_p(filp))
- goto cleanup;
-
- if ((tty->count == 1) && (info->port.count != 1)) {
- /*
- * tty->count is 1 and the tty structure will be freed.
- * info->port.count should be one in this case.
- * if it's not, correct it so that the port is shutdown.
- */
- printk("%s(%d):%s close: bad refcount; tty->count is 1, "
- "info->port.count is %d\n",
- __FILE__,__LINE__, info->device_name, info->port.count);
- info->port.count = 1;
- }
-
- info->port.count--;
-
- /* if at least one open remaining, leave hardware active */
- if (info->port.count)
+ if (tty_port_close_start(&info->port, tty, filp) == 0)
goto cleanup;
-
- info->port.flags |= ASYNC_CLOSING;
-
- /* set tty->closing to notify line discipline to
- * only process XON/XOFF characters. Only the N_TTY
- * discipline appears to use this (ppp does not).
- */
- tty->closing = 1;
-
- /* wait for transmit data to clear all layers */
-
- if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) {
- if (debug_level >= DEBUG_LEVEL_INFO)
- printk("%s(%d):%s close() calling tty_wait_until_sent\n",
- __FILE__,__LINE__, info->device_name );
- tty_wait_until_sent(tty, info->port.closing_wait);
- }
-
+
if (info->port.flags & ASYNC_INITIALIZED)
wait_until_sent(tty, info->timeout);

flush_buffer(tty);
-
tty_ldisc_flush(tty);
-
shutdown(info);

- tty->closing = 0;
+ tty_port_close_end(&info->port, tty);
info->port.tty = NULL;
-
- if (info->port.blocked_open) {
- if (info->port.close_delay) {
- msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
- }
- wake_up_interruptible(&info->port.open_wait);
- }
-
- info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
-
- wake_up_interruptible(&info->port.close_wait);
-
cleanup:
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index 0723664..b3175f5 100644
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -257,3 +257,61 @@ int tty_port_block_til_ready(struct tty_port *port,
}
EXPORT_SYMBOL(tty_port_block_til_ready);

+int tty_port_close_start(struct tty_port *port, struct tty_struct *tty, struct file *filp)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&port->lock, flags);
+ if (tty_hung_up_p(filp)) {
+ spin_unlock_irqrestore(&port->lock, flags);
+ return 0;
+ }
+
+ if( tty->count == 1 && port->count != 1) {
+ printk(KERN_WARNING
+ "tty_port_close_start: tty->count = 1 port count = %d.\n",
+ port->count);
+ port->count = 1;
+ }
+ if (--port->count < 0) {
+ printk(KERN_WARNING "tty_port_close_start: count = %d\n",
+ port->count);
+ port->count = 0;
+ }
+
+ if (port->count) {
+ spin_unlock_irqrestore(&port->lock, flags);
+ return 0;
+ }
+ port->flags |= ASYNC_CLOSING;
+ tty->closing = 1;
+ spin_unlock_irqrestore(&port->lock, flags);
+ if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+ tty_wait_until_sent(tty, port->closing_wait);
+ return 1;
+}
+EXPORT_SYMBOL(tty_port_close_start);
+
+void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)
+{
+ unsigned long flags;
+
+ tty_ldisc_flush(tty);
+
+ spin_lock_irqsave(&port->lock, flags);
+ tty->closing = 0;
+
+ if (port->blocked_open) {
+ spin_unlock_irqrestore(&port->lock, flags);
+ if (port->close_delay) {
+ msleep_interruptible(
+ jiffies_to_msecs(port->close_delay));
+ }
+ spin_lock_irqsave(&port->lock, flags);
+ wake_up_interruptible(&port->open_wait);
+ }
+ port->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
+ wake_up_interruptible(&port->close_wait);
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+EXPORT_SYMBOL(tty_port_close_end);
diff --git a/include/linux/istallion.h b/include/linux/istallion.h
index 053d5ae..7faca98 100644
--- a/include/linux/istallion.h
+++ b/include/linux/istallion.h
@@ -59,7 +59,6 @@ struct stliport {
unsigned int devnr;
int baud_base;
int custom_divisor;
- int close_delay;
int closing_wait;
int rc;
int argsize;
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 61a0ab3..fc39db9 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -441,6 +441,9 @@ extern void tty_port_raise_dtr_rts(struct tty_port *port);
extern void tty_port_hangup(struct tty_port *port);
extern int tty_port_block_til_ready(struct tty_port *port,
struct tty_struct *tty, struct file *filp);
+extern int tty_port_close_start(struct tty_port *port,
+ struct tty_struct *tty, struct file *filp);
+extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);

extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
extern int tty_unregister_ldisc(int disc);