From 8bd2a2489971d3bcdbae6d9d9e9414f04cb0543b Mon Sep 17 00:00:00 2001 From: Eliad Peller Date: Thu, 5 Dec 2013 11:21:27 +0200 Subject: [PATCH] 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]() [] (unwind_backtrace+0x0/0xf0) [] (show_stack+0x10/0x14) [] (dump_stack+0x78/0x94) [] (warn_slowpath_common+0x68/0x8c) [] (warn_slowpath_null+0x1c/0x24) [] (__ieee80211_scan_completed+0x1b4/0x2dc [mac80211]) [] (ieee80211_scan_cancel+0xe8/0x190 [mac80211]) [] (ieee80211_do_stop+0x63c/0x79c [mac80211]) [] (ieee80211_stop+0x10/0x18 [mac80211]) [] (__dev_close_many+0x84/0xcc) [] (__dev_close+0x28/0x3c) [] (__dev_change_flags+0x78/0x144) [] (dev_change_flags+0x10/0x48) [] (devinet_ioctl+0x614/0x6d0) [] (sock_ioctl+0x5c/0x2a4) [] (do_vfs_ioctl+0x7c/0x5d8) [] (SyS_ioctl+0x6c/0x7c) Signed-off-by: Eliad Peller Signed-off-by: Johannes Berg --- net/mac80211/scan.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c index b12bb72..78e968a 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); } -- 2.7.4