mac80211: use a counter for remain-on-channel cookie
Instead of using the pointer which can be re-used
fairly quickly due to allocator patterns and then
makes debugging difficult, maintain a counter and
use its value. Since it's a 64-bit value it can't
really wrap, but catch that case anyway since it
most likely points to a bug somewhere.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/offchannel.c b/net/mac80211/offchannel.c
index c349f3a..0cd42d5 100644
--- a/net/mac80211/offchannel.c
+++ b/net/mac80211/offchannel.c
@@ -204,7 +204,7 @@
roc->frame = NULL;
}
} else {
- cfg80211_ready_on_channel(&roc->sdata->wdev, (unsigned long)roc,
+ cfg80211_ready_on_channel(&roc->sdata->wdev, roc->cookie,
roc->chan, roc->chan_type,
roc->req_duration, GFP_KERNEL);
}
@@ -320,9 +320,8 @@
if (!roc->mgmt_tx_cookie)
cfg80211_remain_on_channel_expired(&roc->sdata->wdev,
- (unsigned long)roc,
- roc->chan, roc->chan_type,
- GFP_KERNEL);
+ roc->cookie, roc->chan,
+ roc->chan_type, GFP_KERNEL);
list_for_each_entry_safe(dep, tmp, &roc->dependents, list)
ieee80211_roc_notify_destroy(dep);
