After going to some trouble to identify only the write-related events

to poll the write socket for, the fifo polling code proceeded to poll
for the complete set of events.  Use 'levents' instead of 'events' as
the argument to poll, and only poll the write socket if there is
interest in write events.

MFC after:	3 days

1 files changed, 2 insertions, 2 deletions

diff --git a/sys/fs/fifofs/fifo_vnops.c b/sys/fs/fifofs/fifo_vnops.c
index c057346..4483fdf 100644
--- a/sys/fs/fifofs/fifo_vnops.c
+++ b/sys/fs/fifofs/fifo_vnops.c
@@ -641,11 +641,11 @@ fifo_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td)
 		}
 	}
 	levents = events & (POLLOUT | POLLWRNORM | POLLWRBAND);
-	if (events) {
+	if (levents) {
 		filetmp.f_data = fip->fi_writesock;
 		filetmp.f_cred = cred;
 		if (filetmp.f_data) {
-			revents |= soo_poll(&filetmp, events, cred, td);
+			revents |= soo_poll(&filetmp, levents, cred, td);
 		}
 	}
 	return (revents);