um: fully use tty_port
... use all tty_port helpers Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger
parent
df7b86f313
commit
79e0273d18
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@ -296,43 +296,14 @@ int line_setup_irq(int fd, int input, int output, struct line *line, void *data)
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return err;
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}
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/*
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* Normally, a driver like this can rely mostly on the tty layer
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* locking, particularly when it comes to the driver structure.
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* However, in this case, mconsole requests can come in "from the
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* side", and race with opens and closes.
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*
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* mconsole config requests will want to be sure the device isn't in
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* use, and get_config, open, and close will want a stable
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* configuration. The checking and modification of the configuration
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* is done under a spinlock. Checking whether the device is in use is
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* line->tty->count > 1, also under the spinlock.
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*
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* line->count serves to decide whether the device should be enabled or
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* disabled on the host. If it's equal to 0, then we are doing the
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* first open or last close. Otherwise, open and close just return.
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*/
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int line_open(struct line *lines, struct tty_struct *tty)
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static int line_activate(struct tty_port *port, struct tty_struct *tty)
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{
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struct line *line = &lines[tty->index];
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int err = -ENODEV;
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int ret;
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struct line *line = tty->driver_data;
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mutex_lock(&line->count_lock);
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if (!line->valid)
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goto out_unlock;
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err = 0;
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if (line->port.count++)
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goto out_unlock;
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BUG_ON(tty->driver_data);
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tty->driver_data = line;
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tty_port_tty_set(&line->port, tty);
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err = enable_chan(line);
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if (err) /* line_close() will be called by our caller */
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goto out_unlock;
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ret = enable_chan(line);
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if (ret)
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return ret;
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if (!line->sigio) {
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chan_enable_winch(line->chan_out, tty);
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@ -340,44 +311,60 @@ int line_open(struct line *lines, struct tty_struct *tty)
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}
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chan_window_size(line, &tty->winsize.ws_row,
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&tty->winsize.ws_col);
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out_unlock:
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mutex_unlock(&line->count_lock);
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return err;
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&tty->winsize.ws_col);
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return 0;
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}
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static const struct tty_port_operations line_port_ops = {
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.activate = line_activate,
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};
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int line_open(struct tty_struct *tty, struct file *filp)
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{
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struct line *line = tty->driver_data;
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return tty_port_open(&line->port, tty, filp);
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}
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int line_install(struct tty_driver *driver, struct tty_struct *tty,
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struct line *line)
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{
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int ret;
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ret = tty_standard_install(driver, tty);
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if (ret)
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return ret;
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tty->driver_data = line;
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return 0;
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}
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static void unregister_winch(struct tty_struct *tty);
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void line_close(struct tty_struct *tty, struct file * filp)
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void line_cleanup(struct tty_struct *tty)
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{
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struct line *line = tty->driver_data;
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/*
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* If line_open fails (and tty->driver_data is never set),
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* tty_open will call line_close. So just return in this case.
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*/
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if (line == NULL)
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return;
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/* We ignore the error anyway! */
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flush_buffer(line);
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mutex_lock(&line->count_lock);
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BUG_ON(!line->valid);
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if (--line->port.count)
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goto out_unlock;
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tty_port_tty_set(&line->port, NULL);
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tty->driver_data = NULL;
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if (line->sigio) {
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unregister_winch(tty);
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line->sigio = 0;
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}
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}
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out_unlock:
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mutex_unlock(&line->count_lock);
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void line_close(struct tty_struct *tty, struct file * filp)
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{
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struct line *line = tty->driver_data;
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tty_port_close(&line->port, tty, filp);
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}
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void line_hangup(struct tty_struct *tty)
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{
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struct line *line = tty->driver_data;
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tty_port_hangup(&line->port);
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}
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void close_lines(struct line *lines, int nlines)
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@ -589,6 +576,7 @@ int register_lines(struct line_driver *line_driver,
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for (i = 0; i < nlines; i++) {
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tty_port_init(&lines[i].port);
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lines[i].port.ops = &line_port_ops;
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spin_lock_init(&lines[i].lock);
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mutex_init(&lines[i].count_lock);
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lines[i].driver = line_driver;
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@ -58,7 +58,11 @@ struct line {
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};
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extern void line_close(struct tty_struct *tty, struct file * filp);
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extern int line_open(struct line *lines, struct tty_struct *tty);
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extern int line_open(struct tty_struct *tty, struct file *filp);
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extern int line_install(struct tty_driver *driver, struct tty_struct *tty,
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struct line *line);
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extern void line_cleanup(struct tty_struct *tty);
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extern void line_hangup(struct tty_struct *tty);
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extern int line_setup(char **conf, unsigned nlines, char **def,
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char *init, char *name);
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extern int line_write(struct tty_struct *tty, const unsigned char *buf,
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@ -87,19 +87,13 @@ static int ssl_remove(int n, char **error_out)
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error_out);
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}
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static int ssl_open(struct tty_struct *tty, struct file *filp)
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static int ssl_install(struct tty_driver *driver, struct tty_struct *tty)
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{
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int err = line_open(serial_lines, tty);
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if (err)
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printk(KERN_ERR "Failed to open serial line %d, err = %d\n",
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tty->index, err);
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return err;
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return line_install(driver, tty, &serial_lines[tty->index]);
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}
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static const struct tty_operations ssl_ops = {
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.open = ssl_open,
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.open = line_open,
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.close = line_close,
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.write = line_write,
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.put_char = line_put_char,
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@ -110,6 +104,9 @@ static const struct tty_operations ssl_ops = {
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.set_termios = line_set_termios,
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.throttle = line_throttle,
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.unthrottle = line_unthrottle,
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.install = ssl_install,
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.cleanup = line_cleanup,
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.hangup = line_hangup,
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};
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/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
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@ -89,21 +89,17 @@ static int con_remove(int n, char **error_out)
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return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
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}
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static int con_open(struct tty_struct *tty, struct file *filp)
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{
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int err = line_open(vts, tty);
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if (err)
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printk(KERN_ERR "Failed to open console %d, err = %d\n",
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tty->index, err);
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return err;
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}
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/* Set in an initcall, checked in an exitcall */
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static int con_init_done = 0;
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static int con_install(struct tty_driver *driver, struct tty_struct *tty)
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{
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return line_install(driver, tty, &vts[tty->index]);
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}
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static const struct tty_operations console_ops = {
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.open = con_open,
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.open = line_open,
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.install = con_install,
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.close = line_close,
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.write = line_write,
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.put_char = line_put_char,
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@ -114,6 +110,8 @@ static const struct tty_operations console_ops = {
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.set_termios = line_set_termios,
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.throttle = line_throttle,
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.unthrottle = line_unthrottle,
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.cleanup = line_cleanup,
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.hangup = line_hangup,
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};
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static void uml_console_write(struct console *console, const char *string,
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