um: fully use tty_port (79e0273d) · Commits · e / devices / android_kernel_sony_msm8994

arch/um/drivers/line.c

+45 −57

Original line number	Diff line number	Diff line
		@@ -296,43 +296,14 @@ int line_setup_irq(int fd, int input, int output, struct line line, void data)
		return err;
		}

		/*
		* Normally, a driver like this can rely mostly on the tty layer
		* locking, particularly when it comes to the driver structure.
		* However, in this case, mconsole requests can come in "from the
		* side", and race with opens and closes.
		*
		* mconsole config requests will want to be sure the device isn't in
		* use, and get_config, open, and close will want a stable
		* configuration. The checking and modification of the configuration
		* is done under a spinlock. Checking whether the device is in use is
		* line->tty->count > 1, also under the spinlock.
		*
		* line->count serves to decide whether the device should be enabled or
		* disabled on the host. If it's equal to 0, then we are doing the
		* first open or last close. Otherwise, open and close just return.
		*/

		int line_open(struct line lines, struct tty_struct tty)
		static int line_activate(struct tty_port port, struct tty_struct tty)
		{
		struct line *line = &lines[tty->index];
		int err = -ENODEV;

		mutex_lock(&line->count_lock);
		if (!line->valid)
		goto out_unlock;

		err = 0;
		if (line->port.count++)
		goto out_unlock;

		BUG_ON(tty->driver_data);
		tty->driver_data = line;
		tty_port_tty_set(&line->port, tty);
		int ret;
		struct line *line = tty->driver_data;

		err = enable_chan(line);
		if (err) /* line_close() will be called by our caller */
		goto out_unlock;
		ret = enable_chan(line);
		if (ret)
		return ret;

		if (!line->sigio) {
		chan_enable_winch(line->chan_out, tty);
		@@ -341,43 +312,59 @@ int line_open(struct line lines, struct tty_struct tty)

		chan_window_size(line, &tty->winsize.ws_row,
		&tty->winsize.ws_col);
		out_unlock:
		mutex_unlock(&line->count_lock);
		return err;

		return 0;
		}

		static void unregister_winch(struct tty_struct *tty);
		static const struct tty_port_operations line_port_ops = {
		.activate = line_activate,
		};

		void line_close(struct tty_struct tty, struct file filp)
		int line_open(struct tty_struct tty, struct file filp)
		{
		struct line *line = tty->driver_data;

		/*
		* If line_open fails (and tty->driver_data is never set),
		* tty_open will call line_close. So just return in this case.
		*/
		if (line == NULL)
		return;
		return tty_port_open(&line->port, tty, filp);
		}

		/* We ignore the error anyway! */
		flush_buffer(line);
		int line_install(struct tty_driver driver, struct tty_struct tty,
		struct line *line)
		{
		int ret;

		mutex_lock(&line->count_lock);
		BUG_ON(!line->valid);
		ret = tty_standard_install(driver, tty);
		if (ret)
		return ret;

		if (--line->port.count)
		goto out_unlock;
		tty->driver_data = line;

		tty_port_tty_set(&line->port, NULL);
		tty->driver_data = NULL;
		return 0;
		}

		static void unregister_winch(struct tty_struct *tty);

		void line_cleanup(struct tty_struct *tty)
		{
		struct line *line = tty->driver_data;

		if (line->sigio) {
		unregister_winch(tty);
		line->sigio = 0;
		}
		}

		out_unlock:
		mutex_unlock(&line->count_lock);
		void line_close(struct tty_struct tty, struct file filp)
		{
		struct line *line = tty->driver_data;

		tty_port_close(&line->port, tty, filp);
		}

		void line_hangup(struct tty_struct *tty)
		{
		struct line *line = tty->driver_data;

		tty_port_hangup(&line->port);
		}

		void close_lines(struct line *lines, int nlines)
		@@ -589,6 +576,7 @@ int register_lines(struct line_driver *line_driver,

		for (i = 0; i < nlines; i++) {
		tty_port_init(&lines[i].port);
		lines[i].port.ops = &line_port_ops;
		spin_lock_init(&lines[i].lock);
		mutex_init(&lines[i].count_lock);
		lines[i].driver = line_driver;

arch/um/drivers/line.h

+5 −1

Original line number	Diff line number	Diff line
		@@ -58,7 +58,11 @@ struct line {
		};

		extern void line_close(struct tty_struct tty, struct file filp);
		extern int line_open(struct line lines, struct tty_struct tty);
		extern int line_open(struct tty_struct tty, struct file filp);
		extern int line_install(struct tty_driver driver, struct tty_struct tty,
		struct line *line);
		extern void line_cleanup(struct tty_struct *tty);
		extern void line_hangup(struct tty_struct *tty);
		extern int line_setup(char conf, unsigned nlines, char def,
		char init, char name);
		extern int line_write(struct tty_struct tty, const unsigned char buf,

arch/um/drivers/ssl.c

+6 −9

Original line number	Diff line number	Diff line
		@@ -87,19 +87,13 @@ static int ssl_remove(int n, char **error_out)
		error_out);
		}

		static int ssl_open(struct tty_struct tty, struct file filp)
		static int ssl_install(struct tty_driver driver, struct tty_struct tty)
		{
		int err = line_open(serial_lines, tty);

		if (err)
		printk(KERN_ERR "Failed to open serial line %d, err = %d\n",
		tty->index, err);

		return err;
		return line_install(driver, tty, &serial_lines[tty->index]);
		}

		static const struct tty_operations ssl_ops = {
		.open = ssl_open,
		.open = line_open,
		.close = line_close,
		.write = line_write,
		.put_char = line_put_char,
		@@ -110,6 +104,9 @@ static const struct tty_operations ssl_ops = {
		.set_termios = line_set_termios,
		.throttle = line_throttle,
		.unthrottle = line_unthrottle,
		.install = ssl_install,
		.cleanup = line_cleanup,
		.hangup = line_hangup,
		};

		/* Changed by ssl_init and referenced by ssl_exit, which are both serialized

arch/um/drivers/stdio_console.c

+9 −11

Original line number	Diff line number	Diff line
		@@ -89,21 +89,17 @@ static int con_remove(int n, char **error_out)
		return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
		}

		static int con_open(struct tty_struct tty, struct file filp)
		{
		int err = line_open(vts, tty);
		if (err)
		printk(KERN_ERR "Failed to open console %d, err = %d\n",
		tty->index, err);

		return err;
		}

		/* Set in an initcall, checked in an exitcall */
		static int con_init_done = 0;

		static int con_install(struct tty_driver driver, struct tty_struct tty)
		{
		return line_install(driver, tty, &vts[tty->index]);
		}

		static const struct tty_operations console_ops = {
		.open = con_open,
		.open = line_open,
		.install = con_install,
		.close = line_close,
		.write = line_write,
		.put_char = line_put_char,
		@@ -114,6 +110,8 @@ static const struct tty_operations console_ops = {
		.set_termios = line_set_termios,
		.throttle = line_throttle,
		.unthrottle = line_unthrottle,
		.cleanup = line_cleanup,
		.hangup = line_hangup,
		};

		static void uml_console_write(struct console console, const char string,