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authorJohannes Berg <johannes@sipsolutions.net>2009-11-19 14:29:39 +0100
committerJohn W. Linville <linville@tuxdriver.com>2009-11-19 11:08:39 -0500
commitceb99fe071eb688255798d89be337affffa2b103 (patch)
tree443cdf6d6fffab53db16006e44fd6506d814fd86 /net/mac80211/util.c
parent8ade00824607fcfa8842572012d4393b40a74a94 (diff)
downloadop-kernel-dev-ceb99fe071eb688255798d89be337affffa2b103.zip
op-kernel-dev-ceb99fe071eb688255798d89be337affffa2b103.tar.gz
mac80211: fix resume
When mac80211 resumes, it currently first sets suspended to false so the driver can start doing things and we can receive frames. However, if we actually receive frames then it can end up starting some work which adds timers and then later runs into a BUG_ON in the timer code because it tries add_timer() on a pending timer. Fix this by keeping track of the resuming process by introducing a new variable 'resuming' which gets set to true early on instead of setting 'suspended' to false, and allow queueing work but not receiving frames while resuming. Reported-by: Maxim Levitsky <maximlevitsky@gmail.com> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/util.c')
-rw-r--r--net/mac80211/util.c19
1 files changed, 9 insertions, 10 deletions
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index aeb65b3..e6c08da 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -520,9 +520,9 @@ EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
*/
static bool ieee80211_can_queue_work(struct ieee80211_local *local)
{
- if (WARN(local->suspended, "queueing ieee80211 work while "
- "going to suspend\n"))
- return false;
+ if (WARN(local->suspended && !local->resuming,
+ "queueing ieee80211 work while going to suspend\n"))
+ return false;
return true;
}
@@ -1025,13 +1025,9 @@ int ieee80211_reconfig(struct ieee80211_local *local)
struct sta_info *sta;
unsigned long flags;
int res;
- bool from_suspend = local->suspended;
- /*
- * We're going to start the hardware, at that point
- * we are no longer suspended and can RX frames.
- */
- local->suspended = false;
+ if (local->suspended)
+ local->resuming = true;
/* restart hardware */
if (local->open_count) {
@@ -1129,11 +1125,14 @@ int ieee80211_reconfig(struct ieee80211_local *local)
* If this is for hw restart things are still running.
* We may want to change that later, however.
*/
- if (!from_suspend)
+ if (!local->suspended)
return 0;
#ifdef CONFIG_PM
+ /* first set suspended false, then resuming */
local->suspended = false;
+ mb();
+ local->resuming = false;
list_for_each_entry(sdata, &local->interfaces, list) {
switch(sdata->vif.type) {
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