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tty: The big operations rework

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- Operations are now a shared const function block as with most other Linux
  objects

- Introduce wrappers for some optional functions to get consistent behaviour

- Wrap put_char which used to be patched by the tty layer

- Document which functions are needed/optional

- Make put_char report success/fail

- Cache the driver->ops pointer in the tty as tty->ops

- Remove various surplus lock calls we no longer need

- Remove proc_write method as noted by Alexey Dobriyan

- Introduce some missing sanity checks where certain driver/ldisc
  combinations would oops as they didn't check needed methods were present

[akpm@linux-foundation.org: fix fs/compat_ioctl.c build]
[akpm@linux-foundation.org: fix isicom]
[akpm@linux-foundation.org: fix arch/ia64/hp/sim/simserial.c build]
[akpm@linux-foundation.org: fix kgdb]
Signed-off-by: Alan Cox <alan@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox
2008-04-30 00:54:13 -07:00
committed by Linus Torvalds
parent 251b8dd7ee
commit f34d7a5b70
30 changed files with 539 additions and 666 deletions
Download Patch File Download Diff File Expand all files Collapse all files

129
drivers/usb/serial/usb-serial.c
View File

@ -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;
}