Commit dabdfac0 authored by Alexander Egorenkov's avatar Alexander Egorenkov Committed by Heiko Carstens
Browse files

s390/zcore: release dump save area on restart or power down 



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: default avatarAlexander Egorenkov <egorenar@linux.ibm.com>
Reviewed-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent 7449ca87

drivers/s390/char/zcore.c

+26 −0
Original line number Diff line number Diff line
@@ -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>
@@ -238,6 +239,28 @@ 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;
@@ -298,6 +321,9 @@ 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);