This is a note to let you know that I've just added the patch titled
s390/zcore: release dump save area on restart or power down
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-zcore-release-dump-save-area-on-restart-or-powe.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5fd97627c54f6d4d231bb841acca75fc3f1937f5
Author: Alexander Egorenkov <egorenar@xxxxxxxxxxxxx>
Date: Thu Feb 25 14:28:52 2021 +0100
s390/zcore: release dump save area on restart or power down
[ Upstream commit dabdfac0e85c8c1e811b10c08742f49285e78a17 ]
The zFCP/NVMe standalone dumper is supposed to release the dump save area
resource as soon as possible but might fail to do so, for instance, if it
crashes. To avoid this situation, register a reboot notifier and ensure
the dump save area resource is released on reboot or power down.
Signed-off-by: Alexander Egorenkov <egorenar@xxxxxxxxxxxxx>
Reviewed-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Stable-dep-of: 0b18c852cc6f ("tracing: Have saved_cmdlines arrays all in one allocation")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index 5f659fa9224a3..1aee6b2ae66fb 100644
--- a/drivers/s390/char/zcore.c
+++ b/drivers/s390/char/zcore.c
@@ -15,6 +15,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
+#include <linux/reboot.h>
#include <asm/asm-offsets.h>
#include <asm/ipl.h>
@@ -247,6 +248,28 @@ static int __init zcore_reipl_init(void)
return 0;
}
+static int zcore_reboot_and_on_panic_handler(struct notifier_block *self,
+ unsigned long event,
+ void *data)
+{
+ if (hsa_available)
+ release_hsa();
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block zcore_reboot_notifier = {
+ .notifier_call = zcore_reboot_and_on_panic_handler,
+ /* we need to be notified before reipl and kdump */
+ .priority = INT_MAX,
+};
+
+static struct notifier_block zcore_on_panic_notifier = {
+ .notifier_call = zcore_reboot_and_on_panic_handler,
+ /* we need to be notified before reipl and kdump */
+ .priority = INT_MAX,
+};
+
static int __init zcore_init(void)
{
unsigned char arch;
@@ -307,6 +330,9 @@ static int __init zcore_init(void)
zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR|S_IWUSR, zcore_dir,
NULL, &zcore_hsa_fops);
+ register_reboot_notifier(&zcore_reboot_notifier);
+ atomic_notifier_chain_register(&panic_notifier_list, &zcore_on_panic_notifier);
+
return 0;
fail:
diag308(DIAG308_REL_HSA, NULL);
