git: 5ea6546660de - stable/14 - LinuxKPI: Improve timer_shutdown_sync

The branch stable/14 has been updated by wulf:

URL: https://cgit.FreeBSD.org/src/commit/?id=5ea6546660def3b853208c3eee236a21d9a317f8

commit 5ea6546660def3b853208c3eee236a21d9a317f8
Author:     Vladimir Kondratyev <wulf@FreeBSD.org>
AuthorDate: 2024-04-08 06:47:42 +0000
Commit:     Vladimir Kondratyev <wulf@FreeBSD.org>
CommitDate: 2024-08-01 21:09:38 +0000

    LinuxKPI: Improve timer_shutdown_sync
    
    timer_shutdown_sync not only shutdowns a timer but prevents it rearming.
    
    Sponsored by:   Serenity CyberSecurity, LLC
    Reviewed by:    emaste
    MFC after:      1 week
    
    (cherry picked from commit 61fb195e8dd08d4b006a176c09682f061424cb95)
---
 sys/compat/linuxkpi/common/src/linux_compat.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c b/sys/compat/linuxkpi/common/src/linux_compat.c
index 894e233042e3..90d03d480089 100644
--- a/sys/compat/linuxkpi/common/src/linux_compat.c
+++ b/sys/compat/linuxkpi/common/src/linux_compat.c
@@ -1920,6 +1920,10 @@ linux_timer_callback_wrapper(void *context)
 
 	timer = context;
 
+	/* the timer is about to be shutdown permanently */
+	if (timer->function == NULL)
+		return;
+
 	if (linux_set_current_flags(curthread, M_NOWAIT)) {
 		/* try again later */
 		callout_reset(&timer->callout, 1,
@@ -1992,6 +1996,7 @@ int
 timer_shutdown_sync(struct timer_list *timer)
 {
 
+	timer->function = NULL;
 	return (del_timer_sync(timer));
 }