1 files changed, 17 insertions, 14 deletions

diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c
index 934458ad55e..4f9f1dcc155 100644
--- a/drivers/s390/char/con3215.c
+++ b/drivers/s390/char/con3215.c
@@ -87,6 +87,7 @@ struct raw3215_info {
 	struct tty_struct *tty;	      /* pointer to tty structure if present */
 	struct raw3215_req *queued_read; /* pointer to queued read requests */
 	struct raw3215_req *queued_write;/* pointer to queued write requests */
+	struct tasklet_struct tlet;   /* tasklet to invoke tty_wakeup */
 	wait_queue_head_t empty_wait; /* wait queue for flushing */
 	struct timer_list timer;      /* timer for delayed output */
 	int line_pos;		      /* position on the line (for tabs) */
@@ -334,19 +335,23 @@ static inline void raw3215_try_io(struct raw3215_info *raw)
 }
 
 /*
+ * Call tty_wakeup from tasklet context
+ */
+static void raw3215_wakeup(unsigned long data)
+{
+	struct raw3215_info *raw = (struct raw3215_info *) data;
+	tty_wakeup(raw->tty);
+}
+
+/*
  * Try to start the next IO and wake up processes waiting on the tty.
  */
 static void raw3215_next_io(struct raw3215_info *raw)
 {
-	struct tty_struct *tty;
-
 	raw3215_mk_write_req(raw);
 	raw3215_try_io(raw);
-	tty = raw->tty;
-	if (tty != NULL &&
-	    RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) {
-	    	tty_wakeup(tty);
-	}
+	if (raw->tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
+		tasklet_schedule(&raw->tlet);
 }
 
 /*
@@ -682,6 +687,7 @@ static int raw3215_probe (struct ccw_device *cdev)
 		return -ENOMEM;
 	}
 	init_waitqueue_head(&raw->empty_wait);
+	tasklet_init(&raw->tlet, raw3215_wakeup, (unsigned long) raw);
 
 	dev_set_drvdata(&cdev->dev, raw);
 	cdev->handler = raw3215_irq;
@@ -901,6 +907,7 @@ static int __init con3215_init(void)
 
 	raw->flags |= RAW3215_FIXED;
 	init_waitqueue_head(&raw->empty_wait);
+	tasklet_init(&raw->tlet, raw3215_wakeup, (unsigned long) raw);
 
 	/* Request the console irq */
 	if (raw3215_startup(raw) != 0) {
@@ -926,13 +933,9 @@ console_initcall(con3215_init);
 static int tty3215_open(struct tty_struct *tty, struct file * filp)
 {
 	struct raw3215_info *raw;
-	int retval, line;
-
-	line = tty->index;
-	if ((line < 0) || (line >= NR_3215))
-		return -ENODEV;
+	int retval;
 
-	raw = raw3215[line];
+	raw = raw3215[tty->index];
 	if (raw == NULL)
 		return -ENODEV;
 
@@ -966,6 +969,7 @@ static void tty3215_close(struct tty_struct *tty, struct file * filp)
 	tty->closing = 1;
 	/* Shutdown the terminal */
 	raw3215_shutdown(raw);
+	tasklet_kill(&raw->tlet);
 	tty->closing = 0;
 	raw->tty = NULL;
 }
@@ -1137,7 +1141,6 @@ static int __init tty3215_init(void)
 	 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
 	 */
 
-	driver->owner = THIS_MODULE;
 	driver->driver_name = "tty3215";
 	driver->name = "ttyS";
 	driver->major = TTY_MAJOR;