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Subject[PATCH 21/69] TTY: hso, add tty_port
Date
And use open count from there. Other members will follow.

Remark: port.count is (and never was) properly protected. Only a mutex
is held, so ISR and all the functions it calls may see an invalid
state.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Jan Dumon <j.dumon@option.com>
---
drivers/net/usb/hso.c | 25 +++++++++++++------------
1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index cdc589e..0b26d75 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -255,9 +255,9 @@ struct hso_serial {
u8 dtr_state;
unsigned tx_urb_used:1;

+ struct tty_port port;
/* from usb_serial_port */
struct tty_struct *tty;
- int open_count;
spinlock_t serial_lock;

int (*write_data) (struct hso_serial *serial);
@@ -1190,7 +1190,7 @@ static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
struct urb *urb;

urb = serial->rx_urb[0];
- if (serial->open_count > 0) {
+ if (serial->port.count > 0) {
count = put_rxbuf_data(urb, serial);
if (count == -1)
return;
@@ -1226,7 +1226,7 @@ static void hso_std_serial_read_bulk_callback(struct urb *urb)
DUMP1(urb->transfer_buffer, urb->actual_length);

/* Anyone listening? */
- if (serial->open_count == 0)
+ if (serial->port.count == 0)
return;

if (status == 0) {
@@ -1311,8 +1311,8 @@ static int hso_serial_open(struct tty_struct *tty, struct file *filp)
spin_unlock_irq(&serial->serial_lock);

/* check for port already opened, if not set the termios */
- serial->open_count++;
- if (serial->open_count == 1) {
+ serial->port.count++;
+ if (serial->port.count == 1) {
serial->rx_state = RX_IDLE;
/* Force default termio settings */
_hso_serial_set_termios(tty, NULL);
@@ -1324,7 +1324,7 @@ static int hso_serial_open(struct tty_struct *tty, struct file *filp)
result = hso_start_serial_device(serial->parent, GFP_KERNEL);
if (result) {
hso_stop_serial_device(serial->parent);
- serial->open_count--;
+ serial->port.count--;
kref_put(&serial->parent->ref, hso_serial_ref_free);
}
} else {
@@ -1361,10 +1361,10 @@ static void hso_serial_close(struct tty_struct *tty, struct file *filp)

/* reset the rts and dtr */
/* do the actual close */
- serial->open_count--;
+ serial->port.count--;

- if (serial->open_count <= 0) {
- serial->open_count = 0;
+ if (serial->port.count <= 0) {
+ serial->port.count = 0;
spin_lock_irq(&serial->serial_lock);
if (serial->tty == tty) {
serial->tty->driver_data = NULL;
@@ -1446,7 +1446,7 @@ static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)

/* the actual setup */
spin_lock_irqsave(&serial->serial_lock, flags);
- if (serial->open_count)
+ if (serial->port.count)
_hso_serial_set_termios(tty, old);
else
tty->termios = old;
@@ -1905,7 +1905,7 @@ static void intr_callback(struct urb *urb)
D1("Pending read interrupt on port %d\n", i);
spin_lock(&serial->serial_lock);
if (serial->rx_state == RX_IDLE &&
- serial->open_count > 0) {
+ serial->port.count > 0) {
/* Setup and send a ctrl req read on
* port i */
if (!serial->rx_urb_filled[0]) {
@@ -2320,6 +2320,7 @@ static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
serial->minor = minor;
serial->magic = HSO_SERIAL_MAGIC;
spin_lock_init(&serial->serial_lock);
+ tty_port_init(&serial->port);
serial->num_rx_urbs = num_urbs;

/* RX, allocate urb and initialize */
@@ -3098,7 +3099,7 @@ static int hso_resume(struct usb_interface *iface)
/* Start all serial ports */
for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
if (serial_table[i] && (serial_table[i]->interface == iface)) {
- if (dev2ser(serial_table[i])->open_count) {
+ if (dev2ser(serial_table[i])->port.count) {
result =
hso_start_serial_device(serial_table[i], GFP_NOIO);
hso_kick_transmit(dev2ser(serial_table[i]));
--
1.7.9.2



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