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s390/con3270: fix insufficient space padding

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con3270 contains an optimisation that reduces the amount of data to be
transmitted to the 3270 terminal by putting a Repeat to Address (RA)
order into the data stream. The RA order itself takes up space, so
con3270 only uses it if there's enough space left in the line
buffer. Otherwise it just pads out the line manually.

For lines that were _just_ short enough that the RA order still fit in
the line buffer, the line was instead padded with an insufficient
amount of spaces. This was caused by examining the size of the
allocated line buffer rather than the length of the string to be
displayed.

For con3270_cline_end(), we just compare against the line length. For
con3270_update_string() however that isn't available anymore, so we
check whether the Repeat to Address order is present.

Fixes: f51320a5 ("[PATCH] s390: new 3270 driver.") (tglx/history.git)
Tested-by: Jing Liu <liujbjl@linux.vnet.ibm.com>
Tested-by: Yang Chen <bjcyang@linux.vnet.ibm.com>
Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sascha Silbe 2016-09-20 19:09:07 +02:00 committed by Martin Schwidefsky
parent c14f2aac7a
commit 6cd997db91
1 changed files with 7 additions and 2 deletions
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9
drivers/s390/char/con3270.c
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@ -124,7 +124,12 @@ con3270_create_status(struct con3270 *cp)
static void
con3270_update_string(struct con3270 *cp, struct string *s, int nr)
{
if (s->len >= cp->view.cols - 5)
if (s->len < 4) {
/* This indicates a bug, but printing a warning would
* cause a deadlock. */
return;
}
if (s->string[s->len - 4] != TO_RA)
return;
raw3270_buffer_address(cp->view.dev, s->string + s->len - 3,
cp->view.cols * (nr + 1));
@ -460,7 +465,7 @@ con3270_cline_end(struct con3270 *cp)
cp->cline->len + 4 : cp->view.cols;
s = con3270_alloc_string(cp, size);
memcpy(s->string, cp->cline->string, cp->cline->len);
if (s->len < cp->view.cols - 5) {
if (cp->cline->len < cp->view.cols - 5) {
s->string[s->len - 4] = TO_RA;
s->string[s->len - 1] = 0;
} else {