s390/con3270: optionally disable auto update

This patch adds a parameter 'auto_update' to the con3270
driver, causing the 'auto_update' feature to be disabled
if unset.
The 'auto_update' feature will cause the con3270 driver
to switch to the console view whenever new system messages
are displayed, which makes working on the 3270 terminal
awkward.

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

3 files changed, 17 insertions, 0 deletions

diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
index bb6b0df50b33..75ffe9980c3e 100644
--- a/drivers/s390/char/con3270.c
+++ b/drivers/s390/char/con3270.c
@@ -7,6 +7,7 @@
  *     Copyright IBM Corp. 2003, 2009
  */
 
+#include <linux/module.h>
 #include <linux/console.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
@@ -30,6 +31,9 @@
 
 static struct raw3270_fn con3270_fn;
 
+static bool auto_update = 1;
+module_param(auto_update, bool, 0);
+
 /*
  * Main 3270 console view data structure.
  */
@@ -204,6 +208,8 @@ con3270_update(struct con3270 *cp)
         struct string *s, *n;
         int rc;
 
+        if (!auto_update && !raw3270_view_active(&cp->view))
+                return;
         if (cp->view.dev)
                 raw3270_activate_view(&cp->view);
 
@@ -529,6 +535,7 @@ con3270_flush(void)
         if (!cp->view.dev)
                 return;
         raw3270_pm_unfreeze(&cp->view);
+        raw3270_activate_view(&cp->view);
         spin_lock_irqsave(&cp->view.lock, flags);
         con3270_wait_write(cp);
         cp->nr_up = 0;
diff --git a/drivers/s390/char/raw3270.c b/drivers/s390/char/raw3270.c
index 041c65bc7bb1..9f849df4381e 100644
--- a/drivers/s390/char/raw3270.c
+++ b/drivers/s390/char/raw3270.c
@@ -276,6 +276,15 @@ __raw3270_start(struct raw3270 *rp, struct raw3270_view *view,
 }
 
 int
+raw3270_view_active(struct raw3270_view *view)
+{
+        struct raw3270 *rp = view->dev;
+
+        return rp && rp->view == view &&
+                !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
+}
+
+int
 raw3270_start(struct raw3270_view *view, struct raw3270_request *rq)
 {
         unsigned long flags;
diff --git a/drivers/s390/char/raw3270.h b/drivers/s390/char/raw3270.h
index 359276a88396..e1e41c2861fb 100644
--- a/drivers/s390/char/raw3270.h
+++ b/drivers/s390/char/raw3270.h
@@ -173,6 +173,7 @@ int raw3270_start_locked(struct raw3270_view *, struct raw3270_request *);
 int raw3270_start_irq(struct raw3270_view *, struct raw3270_request *);
 int raw3270_reset(struct raw3270_view *);
 struct raw3270_view *raw3270_view(struct raw3270_view *);
+int raw3270_view_active(struct raw3270_view *);
 
 /* Reference count inliner for view structures. */
 static inline void