Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6
Conflicts:
net/mac80211/scan.c
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index bc061f6..b822dce 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -345,6 +345,13 @@
if (local->scan_req)
return -EBUSY;
+ if (!list_empty(&local->work_list)) {
+ /* wait for the work to finish/time out */
+ local->scan_req = req;
+ local->scan_sdata = sdata;
+ return 0;
+ }
+
if (local->ops->hw_scan) {
u8 *ies;
@@ -364,29 +371,33 @@
local->hw_scan_req->ie = ies;
local->hw_scan_band = 0;
+
+ /*
+ * After allocating local->hw_scan_req, we must
+ * go through until ieee80211_prep_hw_scan(), so
+ * anything that might be changed here and leave
+ * this function early must not go after this
+ * allocation.
+ */
}
local->scan_req = req;
local->scan_sdata = sdata;
- if (!list_empty(&local->work_list)) {
- /* wait for the work to finish/time out */
- return 0;
- }
-
if (local->ops->hw_scan)
__set_bit(SCAN_HW_SCANNING, &local->scanning);
else
__set_bit(SCAN_SW_SCANNING, &local->scanning);
+
/*
* Kicking off the scan need not be protected,
* only the scan variable stuff, since now
* local->scan_req is assigned and other callers
* will abort their scan attempts.
*
- * This avoids getting a scan_mtx -> iflist_mtx
- * dependency, so that the scan completed calls
- * have more locking freedom.
+ * This avoids too many locking dependencies
+ * so that the scan completed calls have more
+ * locking freedom.
*/
ieee80211_recalc_idle(local);