mac80211: determine completed scan type by defined ops

In some cases, determining the completed scan type was
done by testing the SCAN_HW_SCANNING flag.

However, this doesn't take care for the case in which
the hw scan was requested, but hasn't started yet (e.g.
due to active remain_on_channel).

Replace this test by checking whether ops->hw_scan is
defined.

This solves the following warning:

WARNING: CPU: 0 PID: 3552 at net/mac80211/offchannel.c:156 __ieee80211_scan_completed+0x1b4/0x2dc [mac80211]()
[<c001cd38>] (unwind_backtrace+0x0/0xf0)
[<c00181d0>] (show_stack+0x10/0x14)
[<c05c0d8c>] (dump_stack+0x78/0x94)
[<c0047c08>] (warn_slowpath_common+0x68/0x8c)
[<c0047c48>] (warn_slowpath_null+0x1c/0x24)
[<bf4d4504>] (__ieee80211_scan_completed+0x1b4/0x2dc [mac80211])
[<bf4d5a74>] (ieee80211_scan_cancel+0xe8/0x190 [mac80211])
[<bf4df970>] (ieee80211_do_stop+0x63c/0x79c [mac80211])
[<bf4dfae0>] (ieee80211_stop+0x10/0x18 [mac80211])
[<c0504d84>] (__dev_close_many+0x84/0xcc)
[<c0504df4>] (__dev_close+0x28/0x3c)
[<c0509708>] (__dev_change_flags+0x78/0x144)
[<c0509854>] (dev_change_flags+0x10/0x48)
[<c055fe3c>] (devinet_ioctl+0x614/0x6d0)
[<c04f22a0>] (sock_ioctl+0x5c/0x2a4)
[<c0124eb4>] (do_vfs_ioctl+0x7c/0x5d8)
[<c012547c>] (SyS_ioctl+0x6c/0x7c)

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 7 insertions, 8 deletions

diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index b12bb72a5f37..78e968a41f03 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -271,10 +271,10 @@ static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
         return true;
 }
 
-static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted,
-                                       bool was_hw_scan)
+static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
 {
         struct ieee80211_local *local = hw_to_local(hw);
+        bool hw_scan = local->ops->hw_scan;
 
         lockdep_assert_held(&local->mtx);
 
@@ -290,7 +290,7 @@ static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted,
         if (WARN_ON(!local->scan_req))
                 return;
 
-        if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) {
+        if (hw_scan && !aborted && ieee80211_prep_hw_scan(local)) {
                 int rc;
 
                 rc = drv_hw_scan(local,
@@ -316,7 +316,7 @@ static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted,
         /* Set power back to normal operating levels. */
         ieee80211_hw_config(local, 0);
 
-        if (!was_hw_scan) {
+        if (!hw_scan) {
                 ieee80211_configure_filter(local);
                 drv_sw_scan_complete(local);
                 ieee80211_offchannel_return(local);
@@ -747,7 +747,7 @@ void ieee80211_scan_work(struct work_struct *work)
                 container_of(work, struct ieee80211_local, scan_work.work);
         struct ieee80211_sub_if_data *sdata;
         unsigned long next_delay = 0;
-        bool aborted, hw_scan;
+        bool aborted;
 
         mutex_lock(&local->mtx);
 
@@ -826,8 +826,7 @@ void ieee80211_scan_work(struct work_struct *work)
         goto out;
 
 out_complete:
-        hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
-        __ieee80211_scan_completed(&local->hw, aborted, hw_scan);
+        __ieee80211_scan_completed(&local->hw, aborted);
 out:
         mutex_unlock(&local->mtx);
 }
@@ -965,7 +964,7 @@ void ieee80211_scan_cancel(struct ieee80211_local *local)
          */
         cancel_delayed_work(&local->scan_work);
         /* and clean up */
-        __ieee80211_scan_completed(&local->hw, true, false);
+        __ieee80211_scan_completed(&local->hw, true);
 out:
         mutex_unlock(&local->mtx);
 }