From 84f6a01ce05fa671f7745b6e041e698a2d1f1341 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 20 Aug 2009 20:02:20 +0200 Subject: [PATCH] mac80211: fix configure_filter invocation after stop Since configure_filter can sleep now, any multicast configuration needed to be postponed to a work struct. This, however, lead to a problem that we could queue the work, stop the device and then afterwards invoke configure_filter which may lead to driver hangs and is a bug. To fix this, we can just cancel the filter work since it's unnecessary to do after stopping the hw. Since there are various places that call drv_stop, and two of them do very similar things, the code for them can be put into a shared function at the same time. Signed-off-by: Johannes Berg Reported-by: Lennert Buytenhek Tested-by: Lennert Buytenhek Signed-off-by: John W. Linville --- net/mac80211/ieee80211_i.h | 1 + net/mac80211/iface.c | 6 +----- net/mac80211/pm.c | 13 ++----------- net/mac80211/util.c | 10 ++++++++++ 4 files changed, 14 insertions(+), 16 deletions(-) diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 455cc7ade9f..fa930e01295 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -1086,6 +1086,7 @@ void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata, /* Suspend/resume and hw reconfiguration */ int ieee80211_reconfig(struct ieee80211_local *local); +void ieee80211_stop_device(struct ieee80211_local *local); #ifdef CONFIG_PM int __ieee80211_suspend(struct ieee80211_hw *hw); diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index b161301056d..5940e69fa33 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -552,11 +552,7 @@ static int ieee80211_stop(struct net_device *dev) ieee80211_recalc_ps(local, -1); if (local->open_count == 0) { - drv_stop(local); - - ieee80211_led_radio(local, false); - - flush_workqueue(local->workqueue); + ieee80211_stop_device(local); tasklet_disable(&local->tx_pending_tasklet); tasklet_disable(&local->tasklet); diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c index a5d2f1fb441..e535f1c988f 100644 --- a/net/mac80211/pm.c +++ b/net/mac80211/pm.c @@ -107,17 +107,8 @@ int __ieee80211_suspend(struct ieee80211_hw *hw) } /* stop hardware - this must stop RX */ - if (local->open_count) { - ieee80211_led_radio(local, false); - drv_stop(local); - } - - /* - * flush again, in case driver queued work -- it - * shouldn't be doing (or cancel everything in the - * stop callback) that but better safe than sorry. - */ - flush_workqueue(local->workqueue); + if (local->open_count) + ieee80211_stop_device(local); local->suspended = true; /* need suspended to be visible before quiescing is false */ diff --git a/net/mac80211/util.c b/net/mac80211/util.c index 5eb306377c6..dd656432136 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -1007,6 +1007,16 @@ u32 ieee80211_sta_get_rates(struct ieee80211_local *local, return supp_rates; } +void ieee80211_stop_device(struct ieee80211_local *local) +{ + ieee80211_led_radio(local, false); + + cancel_work_sync(&local->reconfig_filter); + drv_stop(local); + + flush_workqueue(local->workqueue); +} + int ieee80211_reconfig(struct ieee80211_local *local) { struct ieee80211_hw *hw = &local->hw;