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scan: Reference scan_context directly from scan_results

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Store the scan_context pointer in scan_results directly instead of
storing the ifindex.  We now cancel ongoing GET_SCAN commands when the
scan_context is being freed so there's no point going through the extra
step of looking up the scan_context by ifindex inside the command
callback to guard against non-existent scan_contexts.
This commit is contained in:
Andrew Zaborowski 2019-07-08 16:02:56 +02:00 committed by Denis Kenzior
parent 8cada9d1fc
commit 5223dee050
1 changed files with 11 additions and 15 deletions
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26
src/scan.c
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@ -105,8 +105,7 @@ struct scan_context {
};
struct scan_results {
uint32_t wiphy;
uint32_t ifindex;
struct scan_context *sc;
struct l_queue *bss_list;
struct scan_freq_set *freqs;
uint64_t time_stamp;
@ -1177,6 +1176,7 @@ int scan_bss_rank_compare(const void *a, const void *b, void *user_data)
static void get_scan_callback(struct l_genl_msg *msg, void *user_data)
{
struct scan_results *results = user_data;
struct scan_context *sc = results->sc;
struct scan_bss *bss;
uint32_t ifindex;
@ -1189,7 +1189,7 @@ static void get_scan_callback(struct l_genl_msg *msg, void *user_data)
if (!bss)
return;
if (ifindex != results->ifindex) {
if (ifindex != sc->ifindex) {
l_warn("ifindex mismatch in get_scan_callback");
scan_bss_free(bss);
return;
@ -1217,7 +1217,7 @@ static void discover_hidden_network_bsses(struct scan_context *sc,
}
}
static void scan_finished(struct scan_context *sc, uint32_t wiphy,
static void scan_finished(struct scan_context *sc,
int err, struct l_queue *bss_list,
struct scan_request *sr)
{
@ -1254,15 +1254,12 @@ static void scan_finished(struct scan_context *sc, uint32_t wiphy,
static void get_scan_done(void *user)
{
struct scan_results *results = user;
struct scan_context *sc;
struct scan_context *sc = results->sc;
l_debug("get_scan_done");
sc = l_queue_find(scan_contexts, scan_context_match,
L_UINT_TO_PTR(results->ifindex));
if (sc)
scan_finished(sc, results->wiphy, 0, results->bss_list,
results->sr);
if (l_queue_peek_head(sc->requests) == results->sr)
scan_finished(sc, 0, results->bss_list, results->sr);
else
l_queue_destroy(results->bss_list,
(l_queue_destroy_func_t) scan_bss_free);
@ -1392,7 +1389,7 @@ static void scan_notify(struct l_genl_msg *msg, void *user_data)
/* Was this our own scan or an external scan */
if (sc->triggered) {
if (!sr->callback) {
scan_finished(sc, attr_wiphy, -ECANCELED, NULL, sr);
scan_finished(sc, -ECANCELED, NULL, sr);
break;
}
@ -1417,7 +1414,7 @@ static void scan_notify(struct l_genl_msg *msg, void *user_data)
/* An external scan may have flushed our results */
if (sc->started && scan_parse_flush_flag_from_msg(msg))
scan_finished(sc, attr_wiphy, -EAGAIN, NULL, sr);
scan_finished(sc, -EAGAIN, NULL, sr);
else if (sr && !sc->start_cmd_id)
send_next = true;
@ -1432,8 +1429,7 @@ static void scan_notify(struct l_genl_msg *msg, void *user_data)
break;
results = l_new(struct scan_results, 1);
results->wiphy = attr_wiphy;
results->ifindex = attr_ifindex;
results->sc = sc;
results->time_stamp = l_time_now();
results->sr = sr;
@ -1468,7 +1464,7 @@ static void scan_notify(struct l_genl_msg *msg, void *user_data)
if (sc->triggered) {
sc->triggered = false;
scan_finished(sc, attr_wiphy, -ECANCELED, NULL,
scan_finished(sc, -ECANCELED, NULL,
l_queue_peek_head(sc->requests));
} else if (sr && !sc->start_cmd_id && !sc->get_scan_cmd_id) {
/*