From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Thomas Pedersen , "John W. Linville" Subject: [ 85/85] mac80211: call drv_get_tsf() in sleepable context Date: Thu, 25 Oct 2012 17:06:43 -0700 Message-Id: <20121026000039.646690756@linuxfoundation.org> In-Reply-To: <20121026000031.107227138@linuxfoundation.org> References: <20121026000031.107227138@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Thomas Pedersen commit 55fabefe3695241e6ccfa0cd4974f3fa497693dc upstream. The call to drv_get/set_tsf() was put on the workqueue to perform tsf adjustments since that function might sleep. However it ended up inside a spinlock, whose critical section must be atomic. Do tsf adjustment outside the spinlock instead, and get rid of a warning. Signed-off-by: Thomas Pedersen Signed-off-by: John W. Linville Signed-off-by: Greg Kroah-Hartman --- net/mac80211/mesh_sync.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/net/mac80211/mesh_sync.c +++ b/net/mac80211/mesh_sync.c @@ -56,7 +56,6 @@ void mesh_sync_adjust_tbtt(struct ieee80 u64 tsfdelta; spin_lock_bh(&ifmsh->sync_offset_lock); - if (ifmsh->sync_offset_clockdrift_max < beacon_int_fraction) { msync_dbg(sdata, "TBTT : max clockdrift=%lld; adjusting\n", (long long) ifmsh->sync_offset_clockdrift_max); @@ -69,11 +68,11 @@ void mesh_sync_adjust_tbtt(struct ieee80 tsfdelta = -beacon_int_fraction; ifmsh->sync_offset_clockdrift_max -= beacon_int_fraction; } + spin_unlock_bh(&ifmsh->sync_offset_lock); tsf = drv_get_tsf(local, sdata); if (tsf != -1ULL) drv_set_tsf(local, sdata, tsf + tsfdelta); - spin_unlock_bh(&ifmsh->sync_offset_lock); } static void mesh_sync_offset_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,