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cfg80211: Handle bss expiry during connection

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If the BSS is expired during connection, the connect result will
trigger a kernel warning. Ideally cfg80211 should hold the BSS
before the connection is attempted, but as the BSSID is not known
in case of auth/assoc MLME offload (connect op) it doesn't.

For those drivers without the connect op cfg80211 holds down the
reference so it wil not be removed from list.

Fix this by removing the warning and silently adding the BSS back to
the bss list which is return by the driver (with proper BSSID set) or
in case the BSS is already added use that.

The requirements for drivers are documented in the API's.

Signed-off-by: Chaitanya Tata <chaitanya.tata@bluwireless.co.uk>
[formatting fixes, keep old timestamp]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Chaitanya Tata
2019-05-01 18:25:24 +05:30
committed by Johannes Berg
parent cec4f328c9
commit a3ce17d149
4 changed files with 50 additions and 13 deletions
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12
net/wireless/scan.c
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@@ -1092,17 +1092,17 @@ struct cfg80211_non_tx_bss {
};
/* Returned bss is reference counted and must be cleaned up appropriately. */
static struct cfg80211_internal_bss *
struct cfg80211_internal_bss *
cfg80211_bss_update(struct cfg80211_registered_device *rdev,
struct cfg80211_internal_bss *tmp,
bool signal_valid)
bool signal_valid, unsigned long ts)
{
struct cfg80211_internal_bss *found = NULL;
if (WARN_ON(!tmp->pub.channel))
return NULL;
tmp->ts = jiffies;
tmp->ts = ts;
spin_lock_bh(&rdev->bss_lock);
@@ -1425,7 +1425,8 @@ cfg80211_inform_single_bss_data(struct wiphy *wiphy,
signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
wiphy->max_adj_channel_rssi_comp;
res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
jiffies);
if (!res)
return NULL;
@@ -1842,7 +1843,8 @@ cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
wiphy->max_adj_channel_rssi_comp;
res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
jiffies);
if (!res)
return NULL;