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FreeBSD: unregister mountroot eventhandler on unload 

Otherwise if zfs is unloaded and reroot is being used it trips over a
stale pointer.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Closes #16242
This commit is contained in:
Mateusz Guzik 2024-06-14 02:49:50 +02:00 committed by GitHub
parent 20c8bdd85e
commit 121a2d3354
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GPG Key ID: B5690EEEBB952194
1 changed files with 14 additions and 7 deletions
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21
module/os/freebsd/zfs/kmod_core.c
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@ -111,6 +111,7 @@ static int zfs__fini(void);
static void zfs_shutdown(void *, int);
static eventhandler_tag zfs_shutdown_event_tag;
static eventhandler_tag zfs_mountroot_event_tag;
#define ZFS_MIN_KSTACK_PAGES 4
@ -305,16 +306,25 @@ zfs_modevent(module_t mod, int type, void *unused __unused)
switch (type) {
case MOD_LOAD:
err = zfs__init();
if (err == 0)
if (err == 0) {
zfs_shutdown_event_tag = EVENTHANDLER_REGISTER(
shutdown_post_sync, zfs_shutdown, NULL,
SHUTDOWN_PRI_FIRST);
zfs_mountroot_event_tag = EVENTHANDLER_REGISTER(
mountroot, spa_boot_init, NULL,
SI_ORDER_ANY);
}
return (err);
case MOD_UNLOAD:
err = zfs__fini();
if (err == 0 && zfs_shutdown_event_tag != NULL)
EVENTHANDLER_DEREGISTER(shutdown_post_sync,
zfs_shutdown_event_tag);
if (err == 0) {
if (zfs_shutdown_event_tag != NULL)
EVENTHANDLER_DEREGISTER(shutdown_post_sync,
zfs_shutdown_event_tag);
if (zfs_mountroot_event_tag != NULL)
EVENTHANDLER_DEREGISTER(mountroot,
zfs_mountroot_event_tag);
}
return (err);
case MOD_SHUTDOWN:
return (0);
@ -330,9 +340,6 @@ static moduledata_t zfs_mod = {
0
};
#ifdef _KERNEL
EVENTHANDLER_DEFINE(mountroot, spa_boot_init, NULL, 0);
#endif
FEATURE(zfs, "OpenZFS support");