usb_serial: API all change
USB serial likes to use port->tty back pointers for the real work it does and
to do so without any actual locking. Unfortunately when you consider hangup
events, hangup/parallel reopen or even worse hangup followed by parallel close
events the tty->port and port->tty pointers are not guaranteed to be the same
as port->tty is the active tty while tty->port is the port the tty may or
may not still be attached to.
So rework the entire API to pass the tty struct. For console cases we need
to pass both for now. This shows up multiple drivers that immediately crash
with USB console some of which have been fixed in the process.
Longer term we need a proper tty as console abstraction
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/usb/serial/keyspan.h b/drivers/usb/serial/keyspan.h
index 8bf7263..38b4582 100644
--- a/drivers/usb/serial/keyspan.h
+++ b/drivers/usb/serial/keyspan.h
@@ -35,17 +35,18 @@
/* Function prototypes for Keyspan serial converter */
-static int keyspan_open (struct usb_serial_port *port,
+static int keyspan_open (struct tty_struct *tty,
+ struct usb_serial_port *port,
struct file *filp);
-static void keyspan_close (struct usb_serial_port *port,
+static void keyspan_close (struct tty_struct *tty,
+ struct usb_serial_port *port,
struct file *filp);
static int keyspan_startup (struct usb_serial *serial);
static void keyspan_shutdown (struct usb_serial *serial);
-static void keyspan_rx_throttle (struct usb_serial_port *port);
-static void keyspan_rx_unthrottle (struct usb_serial_port *port);
-static int keyspan_write_room (struct usb_serial_port *port);
+static int keyspan_write_room (struct tty_struct *tty);
-static int keyspan_write (struct usb_serial_port *port,
+static int keyspan_write (struct tty_struct *tty,
+ struct usb_serial_port *port,
const unsigned char *buf,
int count);
@@ -53,18 +54,14 @@
int reset_port);
-static int keyspan_chars_in_buffer (struct usb_serial_port *port);
-static int keyspan_ioctl (struct usb_serial_port *port,
- struct file *file,
- unsigned int cmd,
- unsigned long arg);
-static void keyspan_set_termios (struct usb_serial_port *port,
+static void keyspan_set_termios (struct tty_struct *tty,
+ struct usb_serial_port *port,
struct ktermios *old);
-static void keyspan_break_ctl (struct usb_serial_port *port,
+static void keyspan_break_ctl (struct tty_struct *tty,
int break_state);
-static int keyspan_tiocmget (struct usb_serial_port *port,
+static int keyspan_tiocmget (struct tty_struct *tty,
struct file *file);
-static int keyspan_tiocmset (struct usb_serial_port *port,
+static int keyspan_tiocmset (struct tty_struct *tty,
struct file *file, unsigned int set,
unsigned int clear);
static int keyspan_fake_startup (struct usb_serial *serial);
@@ -567,10 +564,6 @@
.close = keyspan_close,
.write = keyspan_write,
.write_room = keyspan_write_room,
- .chars_in_buffer = keyspan_chars_in_buffer,
- .throttle = keyspan_rx_throttle,
- .unthrottle = keyspan_rx_unthrottle,
- .ioctl = keyspan_ioctl,
.set_termios = keyspan_set_termios,
.break_ctl = keyspan_break_ctl,
.tiocmget = keyspan_tiocmget,
@@ -591,10 +584,6 @@
.close = keyspan_close,
.write = keyspan_write,
.write_room = keyspan_write_room,
- .chars_in_buffer = keyspan_chars_in_buffer,
- .throttle = keyspan_rx_throttle,
- .unthrottle = keyspan_rx_unthrottle,
- .ioctl = keyspan_ioctl,
.set_termios = keyspan_set_termios,
.break_ctl = keyspan_break_ctl,
.tiocmget = keyspan_tiocmget,
@@ -615,10 +604,6 @@
.close = keyspan_close,
.write = keyspan_write,
.write_room = keyspan_write_room,
- .chars_in_buffer = keyspan_chars_in_buffer,
- .throttle = keyspan_rx_throttle,
- .unthrottle = keyspan_rx_unthrottle,
- .ioctl = keyspan_ioctl,
.set_termios = keyspan_set_termios,
.break_ctl = keyspan_break_ctl,
.tiocmget = keyspan_tiocmget,