wifi: mac80211: Add link iteration macro for link data

[ Upstream commit f61c7b3d442bef91dd432d468d08f72eadcc3209 ]

Currently before iterating through valid links we are utilizing
open-coding when checking if vif valid_links is a non-zero value.

Add new macro, for_each_link_data(), which iterates through link_id
and checks if it is set on vif valid_links. If it is a valid link then
access link data for that link id.

Signed-off-by: Muna Sinada <muna.sinada@oss.qualcomm.com>
Link: https://patch.msgid.link/20250325213125.1509362-2-muna.sinada@oss.qualcomm.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Stable-dep-of: d87c3ca0f8f1 ("wifi: mac80211: finish link init before RCU publish")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 04c876d78d3bf08369249f26e68726341ac4bb4b..44aad3394084bd8920ca9817a31f958b9e3619b4 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1186,6 +1186,15 @@ ieee80211_vif_get_shift(struct ieee80211_vif *vif)
        return shift;
 }
 
+#define for_each_link_data(sdata, __link)                                      \
+       struct ieee80211_sub_if_data *__sdata = sdata;                          \
+       for (int __link_id = 0;                                                 \
+            __link_id < ARRAY_SIZE((__sdata)->link); __link_id++)              \
+               if ((!(__sdata)->vif.valid_links ||                             \
+                    (__sdata)->vif.valid_links & BIT(__link_id)) &&            \
+                   ((__link) = sdata_dereference((__sdata)->link[__link_id],   \
+                                                 (__sdata))))
+
 static inline int
 ieee80211_get_mbssid_beacon_len(struct cfg80211_mbssid_elems *elems,
                                struct cfg80211_rnr_elems *rnr_elems,