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path: root/drivers/usb/serial
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Diffstat (limited to 'drivers/usb/serial')
-rw-r--r--drivers/usb/serial/digi_acceleport.c3
-rw-r--r--drivers/usb/serial/usb-serial.c129
-rw-r--r--drivers/usb/serial/whiteheat.c4
3 files changed, 25 insertions, 111 deletions
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index d17d1645714f..04a56f300ea6 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -1421,8 +1421,7 @@ static void digi_close(struct usb_serial_port *port, struct file *filp)
tty_wait_until_sent(tty, DIGI_CLOSE_TIMEOUT);
/* flush driver and line discipline buffers */
- if (tty->driver->flush_buffer)
- tty->driver->flush_buffer(tty);
+ tty_driver_flush_buffer(tty);
tty_ldisc_flush(tty);
if (port->serial->dev) {
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index a9934a3f9845..0cb0d77dc429 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -296,16 +296,14 @@ static int serial_write (struct tty_struct * tty, const unsigned char *buf, int
struct usb_serial_port *port = tty->driver_data;
int retval = -ENODEV;
- if (!port || port->serial->dev->state == USB_STATE_NOTATTACHED)
+ if (port->serial->dev->state == USB_STATE_NOTATTACHED)
goto exit;
dbg("%s - port %d, %d byte(s)", __func__, port->number, count);
- if (!port->open_count) {
- retval = -EINVAL;
- dbg("%s - port not opened", __func__);
- goto exit;
- }
+ /* open_count is managed under the mutex lock for the tty so cannot
+ drop to zero until after the last close completes */
+ WARN_ON(!port->open_count);
/* pass on to the driver specific version of this function */
retval = port->serial->type->write(port, buf, count);
@@ -317,61 +315,28 @@ exit:
static int serial_write_room (struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
- int retval = -ENODEV;
-
- if (!port)
- goto exit;
-
dbg("%s - port %d", __func__, port->number);
-
- if (!port->open_count) {
- dbg("%s - port not open", __func__);
- goto exit;
- }
-
+ WARN_ON(!port->open_count);
/* pass on to the driver specific version of this function */
- retval = port->serial->type->write_room(port);
-
-exit:
- return retval;
+ return port->serial->type->write_room(port);
}
static int serial_chars_in_buffer (struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
- int retval = -ENODEV;
-
- if (!port)
- goto exit;
-
dbg("%s = port %d", __func__, port->number);
- if (!port->open_count) {
- dbg("%s - port not open", __func__);
- goto exit;
- }
-
+ WARN_ON(!port->open_count);
/* pass on to the driver specific version of this function */
- retval = port->serial->type->chars_in_buffer(port);
-
-exit:
- return retval;
+ return port->serial->type->chars_in_buffer(port);
}
static void serial_throttle (struct tty_struct * tty)
{
struct usb_serial_port *port = tty->driver_data;
-
- if (!port)
- return;
-
dbg("%s - port %d", __func__, port->number);
- if (!port->open_count) {
- dbg ("%s - port not open", __func__);
- return;
- }
-
+ WARN_ON(!port->open_count);
/* pass on to the driver specific version of this function */
if (port->serial->type->throttle)
port->serial->type->throttle(port);
@@ -380,17 +345,9 @@ static void serial_throttle (struct tty_struct * tty)
static void serial_unthrottle (struct tty_struct * tty)
{
struct usb_serial_port *port = tty->driver_data;
-
- if (!port)
- return;
-
dbg("%s - port %d", __func__, port->number);
- if (!port->open_count) {
- dbg("%s - port not open", __func__);
- return;
- }
-
+ WARN_ON(!port->open_count);
/* pass on to the driver specific version of this function */
if (port->serial->type->unthrottle)
port->serial->type->unthrottle(port);
@@ -401,42 +358,27 @@ static int serial_ioctl (struct tty_struct *tty, struct file * file, unsigned in
struct usb_serial_port *port = tty->driver_data;
int retval = -ENODEV;
- lock_kernel();
- if (!port)
- goto exit;
-
dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
- /* Caution - port->open_count is BKL protected */
- if (!port->open_count) {
- dbg ("%s - port not open", __func__);
- goto exit;
- }
+ WARN_ON(!port->open_count);
/* pass on to the driver specific version of this function if it is available */
- if (port->serial->type->ioctl)
+ if (port->serial->type->ioctl) {
+ lock_kernel();
retval = port->serial->type->ioctl(port, file, cmd, arg);
+ unlock_kernel();
+ }
else
retval = -ENOIOCTLCMD;
-exit:
- unlock_kernel();
return retval;
}
static void serial_set_termios (struct tty_struct *tty, struct ktermios * old)
{
struct usb_serial_port *port = tty->driver_data;
-
- if (!port)
- return;
-
dbg("%s - port %d", __func__, port->number);
- if (!port->open_count) {
- dbg("%s - port not open", __func__);
- return;
- }
-
+ WARN_ON(!port->open_count);
/* pass on to the driver specific version of this function if it is available */
if (port->serial->type->set_termios)
port->serial->type->set_termios(port, old);
@@ -448,24 +390,15 @@ static void serial_break (struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
- lock_kernel();
- if (!port) {
- unlock_kernel();
- return;
- }
-
dbg("%s - port %d", __func__, port->number);
- if (!port->open_count) {
- dbg("%s - port not open", __func__);
- unlock_kernel();
- return;
- }
-
+ WARN_ON(!port->open_count);
/* pass on to the driver specific version of this function if it is available */
- if (port->serial->type->break_ctl)
+ if (port->serial->type->break_ctl) {
+ lock_kernel();
port->serial->type->break_ctl(port, break_state);
- unlock_kernel();
+ unlock_kernel();
+ }
}
static int serial_read_proc (char *page, char **start, off_t off, int count, int *eof, void *data)
@@ -519,19 +452,11 @@ static int serial_tiocmget (struct tty_struct *tty, struct file *file)
{
struct usb_serial_port *port = tty->driver_data;
- if (!port)
- return -ENODEV;
-
dbg("%s - port %d", __func__, port->number);
- if (!port->open_count) {
- dbg("%s - port not open", __func__);
- return -ENODEV;
- }
-
+ WARN_ON(!port->open_count);
if (port->serial->type->tiocmget)
return port->serial->type->tiocmget(port, file);
-
return -EINVAL;
}
@@ -540,19 +465,11 @@ static int serial_tiocmset (struct tty_struct *tty, struct file *file,
{
struct usb_serial_port *port = tty->driver_data;
- if (!port)
- return -ENODEV;
-
dbg("%s - port %d", __func__, port->number);
- if (!port->open_count) {
- dbg("%s - port not open", __func__);
- return -ENODEV;
- }
-
+ WARN_ON(!port->open_count);
if (port->serial->type->tiocmset)
return port->serial->type->tiocmset(port, file, set, clear);
-
return -EINVAL;
}
diff --git a/drivers/usb/serial/whiteheat.c b/drivers/usb/serial/whiteheat.c
index e96bf8663ffc..f07e8a4c1f3d 100644
--- a/drivers/usb/serial/whiteheat.c
+++ b/drivers/usb/serial/whiteheat.c
@@ -673,15 +673,13 @@ static void whiteheat_close(struct usb_serial_port *port, struct file * filp)
}
*/
- if (port->tty->driver->flush_buffer)
- port->tty->driver->flush_buffer(port->tty);
+ tty_driver_flush_buffer(port->tty);
tty_ldisc_flush(port->tty);
firm_report_tx_done(port);
firm_close(port);
-printk(KERN_ERR"Before processing rx_urbs_submitted.\n");
/* shutdown our bulk reads and writes */
mutex_lock(&info->deathwarrant);
spin_lock_irq(&info->lock);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 12:37:29 +0000