From 2b7d18848aeaf7b7936cefa07cc31dea8b07f345 Mon Sep 17 00:00:00 2001
From: "Samuel J. Greear" <sjg@thesjg.com>
Date: Tue, 3 Aug 2010 06:06:27 +0000
Subject: [PATCH] kernel - Silently swallow EOPNOTSUPP filter errors for
 poll(2) in all cases

* This fixes firefox/gconfd/others

Reported-by: tuxillo
---
 sys/kern/sys_generic.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sys/kern/sys_generic.c b/sys/kern/sys_generic.c
index aeb9bf3857..1983388b4a 100644
--- a/sys/kern/sys_generic.c
+++ b/sys/kern/sys_generic.c
@@ -1321,9 +1321,15 @@ poll_copyout(void *arg, struct kevent *kevp, int count, int *res)
 					 * Poll silently swallows any unknown
 					 * errors except in the case of POLLPRI
 					 * (OOB/urgent data).
+					 *
+					 * ALWAYS filter out EOPNOTSUPP errors
+					 * from filters, common applications
+					 * set POLLPRI|POLLRDBAND and most
+					 * filters do not support EVFILT_EXCEPT.
 					 */
 					if (kevp[i].filter != EVFILT_READ &&
-					    kevp[i].filter != EVFILT_WRITE) {
+					    kevp[i].filter != EVFILT_WRITE &&
+					    kevp[i].data != EOPNOTSUPP) {
 						if (pfd->revents == 0)
 							++*res;
 						pfd->revents |= POLLERR;
-- 
2.41.0