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authorRichard Weinberger <richard@nod.at>2012-06-04 21:57:24 +0200
committerRichard Weinberger <richard@nod.at>2012-07-28 17:47:59 +0200
commit79e0273d187c807dfec8d0cf450b8187cab5d3af (patch)
treea4db32f26fb7534dd0b9bd11a94e180bb33b2ff8 /arch/um/drivers/line.c
parentdf7b86f313fd26b5021afde7e66b35f9267b1261 (diff)
downloadblackbird-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.c102
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;
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