diff options
| author | Miri Korenblit <miriam.rachel.korenblit@intel.com> | 2025-06-09 21:35:13 +0300 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2025-07-09 11:41:38 +0200 |
| commit | be1ba9ed221ffb95a8bb15f4c83d0694225ba808 (patch) | |
| tree | 9e4b8e0e05d4ff63fe229dec66ae0ba1b1a740a6 | |
| parent | c8c5e97da9fe77177181930838acb3090a08b7bb (diff) | |
wifi: mac80211: avoid weird state in error path
If we get to the error path of ieee80211_prep_connection, for example
because of a FW issue, then ieee80211_vif_set_links is called
with 0.
But the call to drv_change_vif_links from ieee80211_vif_update_links
will probably fail as well, for the same reason.
In this case, the valid_links and active_links bitmaps will be reverted
to the value of the failing connection.
Then, in the next connection, due to the logic of
ieee80211_set_vif_links_bitmaps, valid_links will be set to the ID of
the new connection assoc link, but the active_links will remain with the
ID of the old connection's assoc link.
If those IDs are different, we get into a weird state of valid_links and
active_links being different. One of the consequences of this state is
to call drv_change_vif_links with new_links as 0, since the & operation
between the bitmaps will be 0.
Since a removal of a link should always succeed, ignore the return value
of drv_change_vif_links if it was called to only remove links, which is
the case for the ieee80211_prep_connection's error path.
That way, the bitmaps will not be reverted to have the value from the
failing connection and will have 0, so the next connection will have a
good state.
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Link: https://patch.msgid.link/20250609213231.ba2011fb435f.Id87ff6dab5e1cf757b54094ac2d714c656165059@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
| -rw-r--r-- | include/net/mac80211.h | 2 | ||||
| -rw-r--r-- | net/mac80211/link.c | 9 |
2 files changed, 10 insertions, 1 deletions
diff --git a/include/net/mac80211.h b/include/net/mac80211.h index dcd5969bb559..a61ffdbf99be 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -4477,6 +4477,8 @@ struct ieee80211_prep_tx_info { * new links bitmaps may be 0 if going from/to a non-MLO situation. * The @old array contains pointers to the old bss_conf structures * that were already removed, in case they're needed. + * Note that removal of link should always succeed, so the return value + * will be ignored in a removal only case. * This callback can sleep. * @change_sta_links: Change the valid links of a station, similar to * @change_vif_links. This callback can sleep. diff --git a/net/mac80211/link.c b/net/mac80211/link.c index 4f7b7d0f64f2..d71eabe5abf8 100644 --- a/net/mac80211/link.c +++ b/net/mac80211/link.c @@ -2,7 +2,7 @@ /* * MLO link handling * - * Copyright (C) 2022-2024 Intel Corporation + * Copyright (C) 2022-2025 Intel Corporation */ #include <linux/slab.h> #include <linux/kernel.h> @@ -368,6 +368,13 @@ static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata, ieee80211_update_apvlan_links(sdata); } + /* + * Ignore errors if we are only removing links as removal should + * always succeed + */ + if (!new_links) + ret = 0; + if (ret) { /* restore config */ memcpy(sdata->link, old_data, sizeof(old_data)); |