6.6-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Weißschuh thomas.weissschuh@linutronix.de
commit 0d9dc27df22d9b5c8dc7185c8dddbc14f5468518 upstream.
On reboot the SCLP interface is deactivated through a reboot notifier. This happens before other components using SCLP have the chance to run their own reboot notifiers. Two of those components are the SCLP console and tty drivers which try to flush the last outstanding messages. At that point the SCLP interface is already unusable and the messages are discarded.
Execute sclp_deactivate() as late as possible to avoid this issue.
Fixes: 4ae46db99cd8 ("s390/consoles: improve panic notifiers reliability") Cc: stable@vger.kernel.org Signed-off-by: Thomas Weißschuh thomas.weissschuh@linutronix.de Reviewed-by: Sven Schnelle svens@linux.ibm.com Link: https://lore.kernel.org/r/20241014-s390-kunit-v1-1-941defa765a6@linutronix.d... Signed-off-by: Heiko Carstens hca@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/s390/char/sclp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/s390/char/sclp.c +++ b/drivers/s390/char/sclp.c @@ -1195,7 +1195,8 @@ sclp_reboot_event(struct notifier_block }
static struct notifier_block sclp_reboot_notifier = { - .notifier_call = sclp_reboot_event + .notifier_call = sclp_reboot_event, + .priority = INT_MIN, };
static ssize_t con_pages_show(struct device_driver *dev, char *buf)