git: 2f12145a37be - stable/13 - kern_reboot: unconditionally call shutdown_reset()

The branch stable/13 has been updated by mhorne:

URL: https://cgit.FreeBSD.org/src/commit/?id=2f12145a37befc2bae3db859699d394611e96e2d

commit 2f12145a37befc2bae3db859699d394611e96e2d
Author:     Mitchell Horne <mhorne@FreeBSD.org>
AuthorDate: 2023-01-23 18:47:11 +0000
Commit:     Mitchell Horne <mhorne@FreeBSD.org>
CommitDate: 2023-02-06 19:34:36 +0000

    kern_reboot: unconditionally call shutdown_reset()
    
    Currently shutdown_reset() is registered as the final entry of the
    shutdown_final event handler. However, if a panic occurs early in boot
    before the event is registered (SI_SUB_INTRINSIC), we may end up
    spinning in the subsequent infinite for loop and failing to reset
    altogether. Instead we can simply call this function unconditionally.
    
    Reviewed by:    markj
    MFC after:      2 weeks
    Differential Revision:  https://reviews.freebsd.org/D37981
    
    (cherry picked from commit 627ca221c311b5d9c4132e03664a96f390ff5c0d)
---
 sys/kern/kern_shutdown.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/sys/kern/kern_shutdown.c b/sys/kern/kern_shutdown.c
index aaa5c5a0243f..ee6faa222206 100644
--- a/sys/kern/kern_shutdown.c
+++ b/sys/kern/kern_shutdown.c
@@ -265,8 +265,6 @@ shutdown_conf(void *unused)
 	    SHUTDOWN_PRI_LAST + 100);
 	EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
 	    SHUTDOWN_PRI_LAST + 100);
-	EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
-	    SHUTDOWN_PRI_LAST + 200);
 }
 
 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
@@ -499,6 +497,12 @@ kern_reboot(int howto)
 	/* Now that we're going to really halt the system... */
 	EVENTHANDLER_INVOKE(shutdown_final, howto);
 
+	/*
+	 * Call this directly so that reset is attempted even if shutdown
+	 * handlers are not yet registered.
+	 */
+	shutdown_reset(NULL, howto);
+
 	for(;;) ;	/* safety against shutdown_reset not working */
 	/* NOTREACHED */
 }