From: Aaron LI <aly@aaronly.me>
Date: Wed, 12 Dec 2018 04:06:17 +0000 (+0800)
Subject: network.subr: Workaround race between wpa_supplicant and dhcpcd
X-Git-Tag: v5.7.0~683
X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/e9136cbfc9bca1a07ab401f4e82a641eed0a004c

network.subr: Workaround race between wpa_supplicant and dhcpcd

Insert a 1-second delay after starting wpa_supplicant(8) to workaround
the race between it and dhcpcd(8), which can modify the interface's
state and break wpa_supplicant's ongoing SSID scan.

dhclient(8) doesn't have such an issue with wpa_supplicant.

Tested-by: me, Daniel Bilik <ddb@neosystem.org>
---

diff --git a/etc/network.subr b/etc/network.subr
index 0d2727da2a..fe4e566043 100644
--- a/etc/network.subr
+++ b/etc/network.subr
@@ -52,6 +52,14 @@ ifconfig_up()
 	if wpaif $1; then
 		ifconfig $1 up
 		/etc/rc.d/wpa_supplicant start $1
+		# NOTE: wpa_supplicant(8) needs to control the interface's
+		#	state in order to perform the SSID scan.  But
+		#	dhcpcd(8), which may be started by the "dhcp_client"
+		#	below, can race against wpa_supplicant(8) and modify
+		#	the interface's state, breaking the SSID scan and
+		#	preventing the SSID association.
+		#	Insert a small delay here to workaround the issue.
+		sleep 1
 		_cfg=0		# XXX: not sure this should count
 	fi