6.11-stable review patch. If anyone has any objections, please let me know.
------------------
From: Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
Reviewed-by: Sven Schnelle <svens@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20241014-s390-kunit-v1-1-941defa765a6@xxxxxxxxxxxxx
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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)
