[PATCH stable 6.12 4/9] um: Set parent-death signal for ubd io thread/process

[Florian Fainelli <florian.fainelli@broadcom.com>]

From: Tiwei Bie <tiwei.btw@antgroup.com>

commit 9b5e6c0f5a9199c69af81ac5bedc512ee7dc20b3 upstream

The ubd io thread is not really a traditional thread. Set the
parent-death signal for it to ensure that it will be killed if
the UML kernel dies unexpectedly without proper cleanup.

Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20241024142828.2612828-3-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
---
 arch/um/drivers/ubd_kern.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 2bfb17373244..66c1a8835e36 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1501,6 +1501,7 @@ int io_thread(void *arg)
 {
 	int n, count, written, res;
 
+	os_set_pdeathsig();
 	os_fix_helper_signals();
 
 	while(1){
-- 
2.34.1