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scan: Sort scan_requests by wiphy work item priority 

Periodic scan requests are meant to be performed with a lower priority
than normal scan requests.  They're thus given a different priority when
inserting them into the wiphy work queue.  Unfortunately, the priority
is not taken into account when they are inserted into the
sr->requests queue.  This can result in the scanning code being confused
since it assumes the top of the queue is always the next scheduled or
currently ongoing scan.  As a result any further wiphy_work might never be
started properly.

Apr 27 16:34:40 iwd[5117]: ../iwd-1.26/src/wiphy.c:wiphy_radio_work_insert() Inserting work item 3
Apr 27 16:34:40 iwd[5117]: ../iwd-1.26/src/wiphy.c:wiphy_radio_work_next() Starting work item 3
Apr 27 16:34:40 iwd[5117]: ../iwd-1.26/src/scan.c:scan_periodic_timeout() 1
Apr 27 16:34:40 iwd[5117]: ../iwd-1.26/src/wiphy.c:wiphy_radio_work_insert() Inserting work item 4
Apr 27 16:34:43 iwd[5117]: ../iwd-1.26/src/wiphy.c:wiphy_radio_work_insert() Inserting work item 5
Apr 27 16:34:43 iwd[5117]: ../iwd-1.26/src/wiphy.c:wiphy_radio_work_done() Work item 3 done
Apr 27 16:34:43 iwd[5117]: ../iwd-1.26/src/wiphy.c:wiphy_radio_work_next() Starting work item 5
Apr 27 16:34:43 iwd[5117]: ../iwd-1.26/src/scan.c:scan_notify() Scan notification Trigger Scan(33)
Apr 27 16:34:43 iwd[5117]: ../iwd-1.26/src/scan.c:scan_request_triggered() Passive scan triggered for wdev 1
Apr 27 16:34:43 iwd[5117]: ../iwd-1.26/src/scan.c:scan_periodic_triggered() Periodic scan triggered for wdev 1

In the above log, scan request 5 (triggered by dbus) is started before
scan request 4 (periodic scan).  Yet the scanning code thinks scan
request 4 was triggered.

Fix this by using the wiphy_work priority to sort the sr->requests queue
so that the scans are ordered in the same manner.

Reported-by: Alvin Šipraga <ALSI@bang-olufsen.dk>
This commit is contained in:
Denis Kenzior 2022-04-28 21:07:39 -05:00
parent 099700a154
commit 1409364371
1 changed files with 19 additions and 2 deletions
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21
src/scan.c
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@ -611,6 +611,17 @@ static struct scan_request *scan_request_new(struct scan_context *sc,
return sr;
}
static int insert_by_priority(const void *a, const void *b, void *user_data)
{
const struct scan_request *cur = b;
int priority = L_PTR_TO_INT(user_data);
if (cur->work.priority <= priority)
return 1;
return -1;
}
static uint32_t scan_common(uint64_t wdev_id, bool passive,
const struct scan_parameters *params,
int priority,
@ -630,7 +641,12 @@ static uint32_t scan_common(uint64_t wdev_id, bool passive,
scan_cmds_add(sr->cmds, sc, passive, params);
l_queue_push_tail(sc->requests, sr);
/*
* sr->work isn't initialized yet, it will be done by
* wiphy_radio_work_insert(). Pass the priority as user_data instead
*/
l_queue_insert(sc->requests, sr, insert_by_priority,
L_INT_TO_PTR(priority));
return wiphy_radio_work_insert(sc->wiphy, &sr->work,
priority, &work_ops);
@ -801,7 +817,8 @@ uint32_t scan_owe_hidden(uint64_t wdev_id, struct l_queue *list,
}
done:
l_queue_push_tail(sc->requests, sr);
l_queue_insert(sc->requests, sr, insert_by_priority,
L_INT_TO_PTR(WIPHY_WORK_PRIORITY_SCAN));
return wiphy_radio_work_insert(sc->wiphy, &sr->work,
WIPHY_WORK_PRIORITY_SCAN, &work_ops);