s390/3270: redraw screen on unsolicited device end

If a 3270 terminal is disconnected and later reconnected again,
it gets an unsolicited device end. This is currently ignored and
you have to hit the clear key to get the screen redrawn.
Add an automatic full redraw of the screen for this case.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
index 75ffe9980c3e..7c511add5aa7 100644
--- a/drivers/s390/char/con3270.c
+++ b/drivers/s390/char/con3270.c
@@ -413,6 +413,10 @@ con3270_irq(struct con3270 *cp, struct raw3270_request *rq, struct irb *irb)
                 else
                         /* Normal end. Copy residual count. */
                         rq->rescnt = irb->scsw.cmd.count;
+        } else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
+                /* Interrupt without an outstanding request -> update all */
+                cp->update_flags = CON_UPDATE_ALL;
+                con3270_set_timer(cp, 1);
         }
         return RAW3270_IO_DONE;
 }
diff --git a/drivers/s390/char/tty3270.c b/drivers/s390/char/tty3270.c
index e91b89dc6d1f..e96fc7fd9498 100644
--- a/drivers/s390/char/tty3270.c
+++ b/drivers/s390/char/tty3270.c
@@ -659,6 +659,10 @@ tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
                 else
                         /* Normal end. Copy residual count. */
                         rq->rescnt = irb->scsw.cmd.count;
+        } else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
+                /* Interrupt without an outstanding request -> update all */
+                tp->update_flags = TTY_UPDATE_ALL;
+                tty3270_set_timer(tp, 1);
         }
         return RAW3270_IO_DONE;
 }