From dccf4ea13b3438a1861fc0e40c034db303686f2e Mon Sep 17 00:00:00 2001
From: msaare123 <33455219+msaare123@users.noreply.github.com>
Date: Tue, 16 Jun 2026 22:24:22 +0300
Subject: [PATCH] fix stuck poll() when interface down

In linux when any of the polled interfaces is brought down (NETDEV_GOING_DOWN)
rings were previosly set to NM_KR_LOCKED state. That caused nm_kr_tryget() to get
stuck in retry loop inside poll() until interface was eventually brought up again.

In this patch the issue was fixed by setting ring state to NM_KR_STOPPED instead of NM_KR_LOCKED.
After the fix poll() will return POLLERR for interface that is brought down which in my mind
is the correct operation.
---
 sys/dev/netmap/netmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/dev/netmap/netmap.c b/sys/dev/netmap/netmap.c
index 53e288a1d..dd1efae77 100644
--- a/sys/dev/netmap/netmap.c
+++ b/sys/dev/netmap/netmap.c
@@ -640,7 +640,7 @@ void
 netmap_disable_all_rings(if_t ifp)
 {
 	if (NM_NA_VALID(ifp)) {
-		netmap_set_all_rings(NA(ifp), NM_KR_LOCKED);
+		netmap_set_all_rings(NA(ifp), NM_KR_STOPPED);
 	}
 }