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author | Alan Cox <alan@lxorguk.ukuu.org.uk> | 2008-04-30 00:54:13 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 08:29:47 -0700 |
commit | f34d7a5b7010b82fe97da95496b9971435530062 (patch) | |
tree | 87e2abec1e33ed4fe5e63ee2fd000bc2ad745e57 /drivers/usb/serial | |
parent | 251b8dd7eee30fda089a1dc088abf4fc9a0dee9c (diff) | |
download | op-kernel-dev-f34d7a5b7010b82fe97da95496b9971435530062.zip op-kernel-dev-f34d7a5b7010b82fe97da95496b9971435530062.tar.gz |
tty: The big operations rework
- 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>
Diffstat (limited to 'drivers/usb/serial')
-rw-r--r-- | drivers/usb/serial/digi_acceleport.c | 3 | ||||
-rw-r--r-- | drivers/usb/serial/usb-serial.c | 129 | ||||
-rw-r--r-- | drivers/usb/serial/whiteheat.c | 4 |
3 files changed, 25 insertions, 111 deletions
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c index d17d164..04a56f3 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 a9934a3..0cb0d77 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 e96bf86..f07e8a4 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); |