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s390/con3270: return from notifier when activate view fails

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When activating the view fails (in this case because the 3270
is disconnected) return from the notifer callback. Otherwise
the system will deadlock.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2022-12-07 22:18:38 +01:00 committed by Heiko Carstens
parent fe5e23dd98
commit 9975fde09e
1 changed files with 6 additions and 2 deletions
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8
drivers/s390/char/con3270.c
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@ -2079,12 +2079,16 @@ static int con3270_notify(struct notifier_block *self,
{
struct tty3270 *tp;
unsigned long flags;
int rc;
tp = condev;
if (!tp->view.dev)
return NOTIFY_DONE;
if (!raw3270_view_lock_unavailable(&tp->view))
raw3270_activate_view(&tp->view);
if (!raw3270_view_lock_unavailable(&tp->view)) {
rc = raw3270_activate_view(&tp->view);
if (rc)
return NOTIFY_DONE;
}
if (!spin_trylock_irqsave(&tp->view.lock, flags))
return NOTIFY_DONE;
con3270_wait_write(tp);