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authorPeter Hurley <peter@hurleysoftware.com>2014-09-10 15:06:34 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-23 21:19:35 -0700
commit136d5258b2bc4ffae99cb69874a76624c26fbfad (patch)
tree1699143576355e462091a5701b2814dc1d2d1d71 /drivers/tty/tty_io.c
parentc545b66c6922b002b5fe224a6eaec58c913650b5 (diff)
tty: Move and rename send_prio_char() as tty_send_xchar()
Relocate the file-scope function, send_prio_char(), as a global helper tty_send_xchar(). Remove the global declarations for tty_write_lock()/tty_write_unlock(), as these are file-scope only now. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_io.c')
-rw-r--r--drivers/tty/tty_io.c33
1 files changed, 31 insertions, 2 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index c249ff1d51ce..2f6f9b5e4891 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1023,14 +1023,14 @@ static ssize_t tty_read(struct file *file, char __user *buf, size_t count,
return i;
}
-void tty_write_unlock(struct tty_struct *tty)
+static void tty_write_unlock(struct tty_struct *tty)
__releases(&tty->atomic_write_lock)
{
mutex_unlock(&tty->atomic_write_lock);
wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
}
-int tty_write_lock(struct tty_struct *tty, int ndelay)
+static int tty_write_lock(struct tty_struct *tty, int ndelay)
__acquires(&tty->atomic_write_lock)
{
if (!mutex_trylock(&tty->atomic_write_lock)) {
@@ -1217,6 +1217,35 @@ ssize_t redirected_tty_write(struct file *file, const char __user *buf,
return tty_write(file, buf, count, ppos);
}
+/**
+ * tty_send_xchar - send priority character
+ *
+ * Send a high priority character to the tty even if stopped
+ *
+ * Locking: none for xchar method, write ordering for write method.
+ */
+
+int tty_send_xchar(struct tty_struct *tty, char ch)
+{
+ int was_stopped = tty->stopped;
+
+ if (tty->ops->send_xchar) {
+ tty->ops->send_xchar(tty, ch);
+ return 0;
+ }
+
+ if (tty_write_lock(tty, 0) < 0)
+ return -ERESTARTSYS;
+
+ if (was_stopped)
+ start_tty(tty);
+ tty->ops->write(tty, &ch, 1);
+ if (was_stopped)
+ stop_tty(tty);
+ tty_write_unlock(tty);
+ return 0;
+}
+
static char ptychar[] = "pqrstuvwxyzabcde";
/**