From: Avraham Stern <avraham.stern@xxxxxxxxx>
Scan results are not propagated to all interfaces if scan results
started a new operation, in order to prevent concurrent operations.
But this causes other interfaces to trigger a new scan when scan
results are already available.
Instead, always notify other interfaces of the scan results, but note
that new operations are not allowed.
Signed-off-by: Avraham Stern <avraham.stern@xxxxxxxxx>
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@xxxxxxxxx>
---
wpa_supplicant/events.c | 29 ++++++++++++++++++++++-------
1 file changed, 22 insertions(+), 7 deletions(-)
diff --git a/wpa_supplicant/events.c b/wpa_supplicant/events.c
index abe3b47..2a9b95d 100644
--- a/wpa_supplicant/events.c
+++ b/wpa_supplicant/events.c
@@ -1474,11 +1474,17 @@ static int wpa_supplicant_need_to_roam(struct wpa_supplicant *wpa_s,
}
-/* Return != 0 if no scan results could be fetched or if scan results should not
- * be shared with other virtual interfaces. */
+/*
+ * Return a negative value if no scan results could be fetched or if scan
+ * results should not be shared with other virtual interfaces.
+ * Return 0 if scan results were fetched and may be shared with other interfaces.
+ * Return 1 if scan results may be shared with other virtual interfaces but may not
+ * trigger any operations.
+ * Return 2 if the interface was removed and cannot no be used.
+ */
static int _wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
union wpa_event_data *data,
- int own_request)
+ int own_request, int update_only)
{
struct wpa_scan_results *scan_res = NULL;
int ret = 0;
@@ -1528,6 +1534,11 @@ static int _wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
}
#endif /* CONFIG_NO_RANDOM_POOL */
+ if (update_only) {
+ ret = 1;
+ goto scan_work_done;
+ }
+
if (own_request && wpa_s->scan_res_handler &&
!(data && data->scan_info.external_scan)) {
void (*scan_res_handler)(struct wpa_supplicant *wpa_s,
@@ -1536,7 +1547,7 @@ static int _wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
scan_res_handler = wpa_s->scan_res_handler;
wpa_s->scan_res_handler = NULL;
scan_res_handler(wpa_s, scan_res);
- ret = -2;
+ ret = 1;
goto scan_work_done;
}
@@ -1757,7 +1768,7 @@ static int wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
struct wpa_supplicant *ifs;
int res;
- res = _wpa_supplicant_event_scan_results(wpa_s, data, 1);
+ res = _wpa_supplicant_event_scan_results(wpa_s, data, 1, 0);
if (res == 2) {
/*
* Interface may have been removed, so must not dereference
@@ -1765,7 +1776,8 @@ static int wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
*/
return 1;
}
- if (res != 0) {
+
+ if (res < 0) {
/*
* If no scan results could be fetched, then no need to
* notify those interfaces that did not actually request
@@ -1785,7 +1797,10 @@ static int wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
if (ifs != wpa_s) {
wpa_printf(MSG_DEBUG, "%s: Updating scan results from "
"sibling", ifs->ifname);
- _wpa_supplicant_event_scan_results(ifs, data, 0);
+ res = _wpa_supplicant_event_scan_results(ifs, data, 0,
+ res > 0);
+ if (res < 0)
+ return 0;
}
}
--
1.9.1
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