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author | Richard Weinberger <richard@nod.at> | 2012-06-04 21:57:24 +0200 |
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committer | Richard Weinberger <richard@nod.at> | 2012-07-28 17:47:59 +0200 |
commit | 79e0273d187c807dfec8d0cf450b8187cab5d3af (patch) | |
tree | a4db32f26fb7534dd0b9bd11a94e180bb33b2ff8 /arch/um/drivers/line.c | |
parent | df7b86f313fd26b5021afde7e66b35f9267b1261 (diff) | |
download | blackbird-op-linux-79e0273d187c807dfec8d0cf450b8187cab5d3af.tar.gz blackbird-op-linux-79e0273d187c807dfec8d0cf450b8187cab5d3af.zip |
um: fully use tty_port
... use all tty_port helpers
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/drivers/line.c')
-rw-r--r-- | arch/um/drivers/line.c | 102 |
1 files changed, 45 insertions, 57 deletions
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c index 131129aec249..95d5e7803bc7 100644 --- a/arch/um/drivers/line.c +++ b/arch/um/drivers/line.c @@ -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); @@ -340,44 +311,60 @@ 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; + &tty->winsize.ws_col); + + 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; + + tty->driver_data = line; - if (--line->port.count) - goto out_unlock; + return 0; +} + +static void unregister_winch(struct tty_struct *tty); - tty_port_tty_set(&line->port, NULL); - tty->driver_data = NULL; +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; |