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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>
This commit is contained in:
Eliad Peller 2013-12-05 11:21:27 +02:00 committed by Johannes Berg
parent 24d584d70e
commit 8bd2a24899
1 changed files with 7 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
net/mac80211/scan.c
View File

@ -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);
}