[PATCH 06/16] TTY: add tty_port_tty_hangup helper

Jiri Slaby
2013-03-07T12:13:30Z

It allows for cleaning up on a considerable amount of places. They did
port_get, hangup, kref_put. Now the only thing needed is to call
tty_port_tty_hangup which does exactly that. And they can also decide
whether to consider CLOCAL or completely ignore that.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
arch/um/drivers/chan_kern.c | 6 +-----
drivers/mmc/card/sdio_uart.c | 13 ++---------
drivers/net/usb/hso.c | 7 +-----
drivers/tty/cyclades.c | 10 ++-------
drivers/tty/moxa.c | 19 ++++++----------
drivers/tty/n_gsm.c | 6 +-----
drivers/tty/nozomi.c | 9 +++-----
drivers/tty/rocket.c | 7 +-----
drivers/tty/serial/ifx6x60.c | 21 ++----------------
drivers/tty/tty_port.c | 17 +++++++++++++++
drivers/usb/class/cdc-acm.c | 24 ++++++---------------
drivers/usb/serial/keyspan.c | 43 +++++++++----------------------------
drivers/usb/serial/option.c | 9 ++------
drivers/usb/serial/sierra.c | 8 ++-----
include/linux/tty.h | 1 +
net/irda/ircomm/ircomm_tty_attach.c | 6 +-----
16 files changed, 58 insertions(+), 148 deletions(-)

diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index 15c553c..bf42825 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -568,11 +568,7 @@ void chan_interrupt(struct line *line, int irq)
reactivate_fd(chan->fd, irq);
if (err == -EIO) {
if (chan->primary) {
- struct tty_struct *tty = tty_port_tty_get(&line->port);
- if (tty != NULL) {
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ tty_port_tty_hangup(&line->port, false);
if (line->chan_out != chan)
close_one_chan(line->chan_out, 1);
}
diff --git a/drivers/mmc/card/sdio_uart.c b/drivers/mmc/card/sdio_uart.c
index c931dfe..f093cea 100644
--- a/drivers/mmc/card/sdio_uart.c
+++ b/drivers/mmc/card/sdio_uart.c
@@ -134,7 +134,6 @@ static void sdio_uart_port_put(struct sdio_uart_port *port)
static void sdio_uart_port_remove(struct sdio_uart_port *port)
{
struct sdio_func *func;
- struct tty_struct *tty;

BUG_ON(sdio_uart_table[port->index] != port);

@@ -155,12 +154,8 @@ static void sdio_uart_port_remove(struct sdio_uart_port *port)
sdio_claim_host(func);
port->func = NULL;
mutex_unlock(&port->func_lock);
- tty = tty_port_tty_get(&port->port);
/* tty_hangup is async so is this safe as is ?? */
- if (tty) {
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ tty_port_tty_hangup(&port->port, false);
mutex_unlock(&port->port.mutex);
sdio_release_irq(func);
sdio_disable_func(func);
@@ -492,11 +487,7 @@ static void sdio_uart_check_modem_status(struct sdio_uart_port *port)
wake_up_interruptible(&port->port.open_wait);
else {
/* DCD drop - hang up if tty attached */
- tty = tty_port_tty_get(&port->port);
- if (tty) {
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ tty_port_tty_hangup(&port->port, false);
}
}
if (status & UART_MSR_DCTS) {
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index a7714b4..cba1d46 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -3124,18 +3124,13 @@ static void hso_serial_ref_free(struct kref *ref)
static void hso_free_interface(struct usb_interface *interface)
{
struct hso_serial *hso_dev;
- struct tty_struct *tty;
int i;

for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
if (serial_table[i] &&
(serial_table[i]->interface == interface)) {
hso_dev = dev2ser(serial_table[i]);
- tty = tty_port_tty_get(&hso_dev->port);
- if (tty) {
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ tty_port_tty_hangup(&hso_dev->port, false);
mutex_lock(&hso_dev->parent->mutex);
hso_dev->parent->usb_gone = 1;
mutex_unlock(&hso_dev->parent->mutex);
diff --git a/drivers/tty/cyclades.c b/drivers/tty/cyclades.c
index 345bd0e..33f83fe 100644
--- a/drivers/tty/cyclades.c
+++ b/drivers/tty/cyclades.c
@@ -1124,14 +1124,8 @@ static void cyz_handle_cmd(struct cyclades_card *cinfo)
readl(&info->u.cyz.ch_ctrl->rs_status);
if (dcd & C_RS_DCD)
wake_up_interruptible(&info->port.open_wait);
- else {
- struct tty_struct *tty;
- tty = tty_port_tty_get(&info->port);
- if (tty) {
- tty_hangup(tty);
- tty_kref_put(tty);
- }
- }
+ else
+ tty_port_tty_hangup(&info->port, false);
}
break;
case C_CM_MCTS:
diff --git a/drivers/tty/moxa.c b/drivers/tty/moxa.c
index adeac25..1deaca4 100644
--- a/drivers/tty/moxa.c
+++ b/drivers/tty/moxa.c
@@ -913,16 +913,12 @@ static void moxa_board_deinit(struct moxa_board_conf *brd)

/* pci hot-un-plug support */
for (a = 0; a < brd->numPorts; a++)
- if (brd->ports[a].port.flags & ASYNC_INITIALIZED) {
- struct tty_struct *tty = tty_port_tty_get(
- &brd->ports[a].port);
- if (tty) {
- tty_hangup(tty);
- tty_kref_put(tty);
- }
- }
+ if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
+ tty_port_tty_hangup(&brd->ports[a].port, false);
+
for (a = 0; a < MAX_PORTS_PER_BOARD; a++)
tty_port_destroy(&brd->ports[a].port);
+
while (1) {
opened = 0;
for (a = 0; a < brd->numPorts; a++)
@@ -1365,7 +1361,6 @@ static void moxa_hangup(struct tty_struct *tty)

static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
{
- struct tty_struct *tty;
unsigned long flags;
dcd = !!dcd;

@@ -1373,10 +1368,8 @@ static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
if (dcd != p->DCDState) {
p->DCDState = dcd;
spin_unlock_irqrestore(&p->port.lock, flags);
- tty = tty_port_tty_get(&p->port);
- if (tty && !C_CLOCAL(tty) && !dcd)
- tty_hangup(tty);
- tty_kref_put(tty);
+ if (!dcd)
+ tty_port_tty_hangup(&p->port, true);
}
else
spin_unlock_irqrestore(&p->port.lock, flags);
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 4a43ef5d7..74d9a02 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -1418,11 +1418,7 @@ static void gsm_dlci_close(struct gsm_dlci *dlci)
pr_debug("DLCI %d goes closed.\n", dlci->addr);
dlci->state = DLCI_CLOSED;
if (dlci->addr != 0) {
- struct tty_struct *tty = tty_port_tty_get(&dlci->port);
- if (tty) {
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ tty_port_tty_hangup(&dlci->port, false);
kfifo_reset(dlci->fifo);
} else
dlci->gsm->dead = 1;
diff --git a/drivers/tty/nozomi.c b/drivers/tty/nozomi.c
index 2e5bbdc..d6080c3 100644
--- a/drivers/tty/nozomi.c
+++ b/drivers/tty/nozomi.c
@@ -1501,12 +1501,9 @@ static void tty_exit(struct nozomi *dc)

DBG1(" ");

- for (i = 0; i < MAX_PORT; ++i) {
- struct tty_struct *tty = tty_port_tty_get(&dc->port[i].port);
- if (tty && list_empty(&tty->hangup_work.entry))
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ for (i = 0; i < MAX_PORT; ++i)
+ tty_port_tty_hangup(&dc->port[i].port, false);
+
/* Racy below - surely should wait for scheduled work to be done or
complete off a hangup method ? */
while (dc->open_ttys)
diff --git a/drivers/tty/rocket.c b/drivers/tty/rocket.c
index 1d27003..bbffd7a 100644
--- a/drivers/tty/rocket.c
+++ b/drivers/tty/rocket.c
@@ -521,15 +521,10 @@ static void rp_handle_port(struct r_port *info)
(ChanStatus & CD_ACT) ? "on" : "off");
#endif
if (!(ChanStatus & CD_ACT) && info->cd_status) {
- struct tty_struct *tty;
#ifdef ROCKET_DEBUG_HANGUP
printk(KERN_INFO "CD drop, calling hangup.\n");
#endif
- tty = tty_port_tty_get(&info->port);
- if (tty) {
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ tty_port_tty_hangup(&info->port, false);
}
info->cd_status = (ChanStatus & CD_ACT) ? 1 : 0;
wake_up_interruptible(&info->port.open_wait);
diff --git a/drivers/tty/serial/ifx6x60.c b/drivers/tty/serial/ifx6x60.c
index d723d41..2c77fed 100644
--- a/drivers/tty/serial/ifx6x60.c
+++ b/drivers/tty/serial/ifx6x60.c
@@ -270,23 +270,6 @@ static void mrdy_assert(struct ifx_spi_device *ifx_dev)
}

/**
- * ifx_spi_hangup - hang up an IFX device
- * @ifx_dev: our SPI device
- *
- * Hang up the tty attached to the IFX device if one is currently
- * open. If not take no action
- */
-static void ifx_spi_ttyhangup(struct ifx_spi_device *ifx_dev)
-{
- struct tty_port *pport = &ifx_dev->tty_port;
- struct tty_struct *tty = tty_port_tty_get(pport);
- if (tty) {
- tty_hangup(tty);
- tty_kref_put(tty);
- }
-}
-
-/**
* ifx_spi_timeout - SPI timeout
* @arg: our SPI device
*
@@ -298,7 +281,7 @@ static void ifx_spi_timeout(unsigned long arg)
struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *)arg;

dev_warn(&ifx_dev->spi_dev->dev, "*** SPI Timeout ***");
- ifx_spi_ttyhangup(ifx_dev);
+ tty_port_tty_hangup(&ifx_dev->tty_port, false);
mrdy_set_low(ifx_dev);
clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
}
@@ -933,7 +916,7 @@ static irqreturn_t ifx_spi_reset_interrupt(int irq, void *dev)
set_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);
if (!solreset) {
/* unsolicited reset */
- ifx_spi_ttyhangup(ifx_dev);
+ tty_port_tty_hangup(&ifx_dev->tty_port, false);
}
} else {
/* exited reset */
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 8bb757c..7f38eea 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -233,6 +233,23 @@ void tty_port_hangup(struct tty_port *port)
EXPORT_SYMBOL(tty_port_hangup);

/**
+ * tty_port_tty_hangup - helper to hang up a tty
+ *
+ * @port: tty port
+ * @check_clocal: hang only ttys with CLOCAL unset?
+ */
+void tty_port_tty_hangup(struct tty_port *port, bool check_clocal)
+{
+ struct tty_struct *tty = tty_port_tty_get(port);
+
+ if (tty && (!check_clocal || !C_CLOCAL(tty))) {
+ tty_hangup(tty);
+ tty_kref_put(tty);
+ }
+}
+EXPORT_SYMBOL_GPL(tty_port_tty_hangup);
+
+/**
* tty_port_tty_wakeup - helper to wake up a tty
*
* @port: tty port
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 755766e..27a1874 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -292,7 +292,6 @@ static void acm_ctrl_irq(struct urb *urb)
{
struct acm *acm = urb->context;
struct usb_cdc_notification *dr = urb->transfer_buffer;
- struct tty_struct *tty;
unsigned char *data;
int newctrl;
int retval;
@@ -327,17 +326,12 @@ static void acm_ctrl_irq(struct urb *urb)
break;

case USB_CDC_NOTIFY_SERIAL_STATE:
- tty = tty_port_tty_get(&acm->port);
newctrl = get_unaligned_le16(data);

- if (tty) {
- if (!acm->clocal &&
- (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
- dev_dbg(&acm->control->dev,
- "%s - calling hangup\n", __func__);
- tty_hangup(tty);
- }
- tty_kref_put(tty);
+ if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
+ dev_dbg(&acm->control->dev, "%s - calling hangup\n",
+ __func__);
+ tty_port_tty_hangup(&acm->port, false);
}

acm->ctrlin = newctrl;
@@ -1498,15 +1492,9 @@ err_out:
static int acm_reset_resume(struct usb_interface *intf)
{
struct acm *acm = usb_get_intfdata(intf);
- struct tty_struct *tty;

- if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
- tty = tty_port_tty_get(&acm->port);
- if (tty) {
- tty_hangup(tty);
- tty_kref_put(tty);
- }
- }
+ if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
+ tty_port_tty_hangup(&acm->port, false);

return acm_resume(intf);
}
diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c
index 1fd1935..b011478 100644
--- a/drivers/usb/serial/keyspan.c
+++ b/drivers/usb/serial/keyspan.c
@@ -378,7 +378,6 @@ static void usa26_instat_callback(struct urb *urb)
struct usb_serial *serial;
struct usb_serial_port *port;
struct keyspan_port_private *p_priv;
- struct tty_struct *tty;
int old_dcd_state, err;
int status = urb->status;

@@ -421,12 +420,8 @@ static void usa26_instat_callback(struct urb *urb)
p_priv->dcd_state = ((msg->gpia_dcd) ? 1 : 0);
p_priv->ri_state = ((msg->ri) ? 1 : 0);

- if (old_dcd_state != p_priv->dcd_state) {
- tty = tty_port_tty_get(&port->port);
- if (tty && !C_CLOCAL(tty))
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ if (old_dcd_state != p_priv->dcd_state)
+ tty_port_tty_hangup(&port->port, true);

/* Resubmit urb so we continue receiving */
err = usb_submit_urb(urb, GFP_ATOMIC);
@@ -510,7 +505,6 @@ static void usa28_instat_callback(struct urb *urb)
struct usb_serial *serial;
struct usb_serial_port *port;
struct keyspan_port_private *p_priv;
- struct tty_struct *tty;
int old_dcd_state;
int status = urb->status;

@@ -551,12 +545,8 @@ static void usa28_instat_callback(struct urb *urb)
p_priv->dcd_state = ((msg->dcd) ? 1 : 0);
p_priv->ri_state = ((msg->ri) ? 1 : 0);

- if (old_dcd_state != p_priv->dcd_state && old_dcd_state) {
- tty = tty_port_tty_get(&port->port);
- if (tty && !C_CLOCAL(tty))
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ if (old_dcd_state != p_priv->dcd_state && old_dcd_state)
+ tty_port_tty_hangup(&port->port, true);

/* Resubmit urb so we continue receiving */
err = usb_submit_urb(urb, GFP_ATOMIC);
@@ -642,12 +632,8 @@ static void usa49_instat_callback(struct urb *urb)
p_priv->dcd_state = ((msg->dcd) ? 1 : 0);
p_priv->ri_state = ((msg->ri) ? 1 : 0);

- if (old_dcd_state != p_priv->dcd_state && old_dcd_state) {
- struct tty_struct *tty = tty_port_tty_get(&port->port);
- if (tty && !C_CLOCAL(tty))
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ if (old_dcd_state != p_priv->dcd_state && old_dcd_state)
+ tty_port_tty_hangup(&port->port, true);

/* Resubmit urb so we continue receiving */
err = usb_submit_urb(urb, GFP_ATOMIC);
@@ -851,7 +837,6 @@ static void usa90_instat_callback(struct urb *urb)
struct usb_serial *serial;
struct usb_serial_port *port;
struct keyspan_port_private *p_priv;
- struct tty_struct *tty;
int old_dcd_state, err;
int status = urb->status;

@@ -880,12 +865,8 @@ static void usa90_instat_callback(struct urb *urb)
p_priv->dcd_state = ((msg->dcd) ? 1 : 0);
p_priv->ri_state = ((msg->ri) ? 1 : 0);

- if (old_dcd_state != p_priv->dcd_state && old_dcd_state) {
- tty = tty_port_tty_get(&port->port);
- if (tty && !C_CLOCAL(tty))
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ if (old_dcd_state != p_priv->dcd_state && old_dcd_state)
+ tty_port_tty_hangup(&port->port, true);

/* Resubmit urb so we continue receiving */
err = usb_submit_urb(urb, GFP_ATOMIC);
@@ -953,12 +934,8 @@ static void usa67_instat_callback(struct urb *urb)
p_priv->cts_state = ((msg->hskia_cts) ? 1 : 0);
p_priv->dcd_state = ((msg->gpia_dcd) ? 1 : 0);

- if (old_dcd_state != p_priv->dcd_state && old_dcd_state) {
- struct tty_struct *tty = tty_port_tty_get(&port->port);
- if (tty && !C_CLOCAL(tty))
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ if (old_dcd_state != p_priv->dcd_state && old_dcd_state)
+ tty_port_tty_hangup(&port->port, true);

/* Resubmit urb so we continue receiving */
err = usb_submit_urb(urb, GFP_ATOMIC);
diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index f7d339d..602d1f3 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -1532,13 +1532,8 @@ static void option_instat_callback(struct urb *urb)
portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
portdata->ri_state = ((signals & 0x08) ? 1 : 0);

- if (old_dcd_state && !portdata->dcd_state) {
- struct tty_struct *tty =
- tty_port_tty_get(&port->port);
- if (tty && !C_CLOCAL(tty))
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ if (old_dcd_state && !portdata->dcd_state)
+ tty_port_tty_hangup(&port->port, true);
} else {
dev_dbg(dev, "%s: type %x req %x\n", __func__,
req_pkt->bRequestType, req_pkt->bRequest);
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index c13f6e7..d66148a 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -628,7 +628,6 @@ static void sierra_instat_callback(struct urb *urb)
unsigned char signals = *((unsigned char *)
urb->transfer_buffer +
sizeof(struct usb_ctrlrequest));
- struct tty_struct *tty;

dev_dbg(&port->dev, "%s: signal x%x\n", __func__,
signals);
@@ -639,11 +638,8 @@ static void sierra_instat_callback(struct urb *urb)
portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
portdata->ri_state = ((signals & 0x08) ? 1 : 0);

- tty = tty_port_tty_get(&port->port);
- if (tty && !C_CLOCAL(tty) &&
- old_dcd_state && !portdata->dcd_state)
- tty_hangup(tty);
- tty_kref_put(tty);
+ if (old_dcd_state && !portdata->dcd_state)
+ tty_port_tty_hangup(&port->port, true);
} else {
dev_dbg(&port->dev, "%s: type %x req %x\n",
__func__, req_pkt->bRequestType,
diff --git a/include/linux/tty.h b/include/linux/tty.h
index fc056d4..d9b96ff 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -516,6 +516,7 @@ extern int tty_port_carrier_raised(struct tty_port *port);
extern void tty_port_raise_dtr_rts(struct tty_port *port);
extern void tty_port_lower_dtr_rts(struct tty_port *port);
extern void tty_port_hangup(struct tty_port *port);
+extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
extern void tty_port_tty_wakeup(struct tty_port *port);
extern int tty_port_block_til_ready(struct tty_port *port,
struct tty_struct *tty, struct file *filp);
diff --git a/net/irda/ircomm/ircomm_tty_attach.c b/net/irda/ircomm/ircomm_tty_attach.c
index edab393..a2a508f 100644
--- a/net/irda/ircomm/ircomm_tty_attach.c
+++ b/net/irda/ircomm/ircomm_tty_attach.c
@@ -997,12 +997,8 @@ static int ircomm_tty_state_ready(struct ircomm_tty_cb *self,
self->settings.dce = IRCOMM_DELTA_CD;
ircomm_tty_check_modem_status(self);
} else {
- struct tty_struct *tty = tty_port_tty_get(&self->port);
IRDA_DEBUG(0, "%s(), hanging up!\n", __func__ );
- if (tty) {
- tty_hangup(tty);
- tty_kref_put(tty);
- }
+ tty_port_tty_hangup(&self->port, false);
}
break;
default:
--
1.8.1.4