[PATCH 05/11] wpa_s: check if sched_scan is supported before using it

[Luciano Coelho]

Previously, we were trying to use scheduled scan without checking
whether the driver supports it.  This is okay, but it is not efficient
because we need to go all the way down to the kernel driver before we
find out it is not supported.

This patch adds a capability flag in wpa_supplicant that is used to
check whether sched_scan is supported or not.

Signed-off-by: Luciano Coelho <coelho at ti.com>
---
 src/drivers/driver.h              |    1 +
 wpa_supplicant/scan.c             |    3 +++
 wpa_supplicant/wpa_supplicant.c   |    1 +
 wpa_supplicant/wpa_supplicant_i.h |    1 +
 4 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/src/drivers/driver.h b/src/drivers/driver.h
index 5db525a..c0914fc 100644
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -695,6 +695,7 @@ struct wpa_driver_capa {
 
 	int max_scan_ssids;
 	int max_sched_scan_ssids;
+	int sched_scan_supported;
 
 	/**
 	 * max_remain_on_chan - Maximum remain-on-channel duration in msec
diff --git a/wpa_supplicant/scan.c b/wpa_supplicant/scan.c
index 6bf007c..151a1fa 100644
--- a/wpa_supplicant/scan.c
+++ b/wpa_supplicant/scan.c
@@ -590,6 +590,9 @@ int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 	int use_wildcard = 0;
 	int max_sched_scan_ssids;
 
+	if (!wpa_s->sched_scan_supported)
+		return -EOPNOTSUPP;
+
 	if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
 		max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
 	else
diff --git a/wpa_supplicant/wpa_supplicant.c b/wpa_supplicant/wpa_supplicant.c
index 6194c9a..320e16c 100644
--- a/wpa_supplicant/wpa_supplicant.c
+++ b/wpa_supplicant/wpa_supplicant.c
@@ -2248,6 +2248,7 @@ next_driver:
 		}
 		wpa_s->max_scan_ssids = capa.max_scan_ssids;
 		wpa_s->max_sched_scan_ssids = capa.max_sched_scan_ssids;
+		wpa_s->sched_scan_supported = capa.sched_scan_supported;
 		wpa_s->max_remain_on_chan = capa.max_remain_on_chan;
 		wpa_s->max_stations = capa.max_stations;
 	}
diff --git a/wpa_supplicant/wpa_supplicant_i.h b/wpa_supplicant/wpa_supplicant_i.h
index 8a7cb97..2c5c805 100644
--- a/wpa_supplicant/wpa_supplicant_i.h
+++ b/wpa_supplicant/wpa_supplicant_i.h
@@ -429,6 +429,7 @@ struct wpa_supplicant {
 	unsigned int drv_flags;
 	int max_scan_ssids;
 	int max_sched_scan_ssids;
+	int sched_scan_supported;
 	unsigned int max_remain_on_chan;
 	unsigned int max_stations;
 
-- 
1.7.1