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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2016-04-28 17:32:13 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-05-04 17:29:52 +0300
commit2e63a3a66655d5fe5d85c090b009979870436c00 (patch)
treeb371c5960714a2f4888a884e17eb5ab113f9d76e /drivers/s390
parentb512353c15fe7665893e92e0c989c088505a37b8 (diff)
downloadlinux-2e63a3a66655d5fe5d85c090b009979870436c00.tar.xz
s390/3270: fix garbled output on 3270 tty view
The tty3270_update function tries to optimize the output stream by skipping the TO_SBA command to position the output offset if the TO_RA command of the previous line ended at the same offset. But some lines do not have the TO_RA at the end, namely those with a length equal to the number of columns. Make sure there is a TO_RA at the end of the previous line to avoid funny looking output. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/char/tty3270.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/s390/char/tty3270.c b/drivers/s390/char/tty3270.c
index e8afa07f082e..54ea5a01e30d 100644
--- a/drivers/s390/char/tty3270.c
+++ b/drivers/s390/char/tty3270.c
@@ -405,7 +405,10 @@ tty3270_update(struct tty3270 *tp)
if (raw3270_request_add_data(wrq, str, len) != 0)
break;
list_del_init(&s->update);
- sba = s->string + s->len - 3;
+ if (s->string[s->len - 4] == TO_RA)
+ sba = s->string + s->len - 3;
+ else
+ sba = invalid_sba;
}
if (list_empty(&tp->update))
updated |= TTY_UPDATE_LIST;