[PATCH 28/30] backports: Make ieee80211_tx_status handling work on older kernel versions

The commit f02dff93e26b ("mac80211: extend ieee80211_tx_status_ext to
support bulk free") makes use of the list attribute in the skb, but this
is not available in kernel < 4.19, use the sk_buff_head instead on these
kernel versions.

Signed-off-by: Hauke Mehrtens <[email protected]>
---
 patches/0097-skb-list/mac80211-status.patch | 47 +++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 patches/0097-skb-list/mac80211-status.patch

diff --git a/patches/0097-skb-list/mac80211-status.patch b/patches/0097-skb-list/mac80211-status.patch
new file mode 100644
index 00000000..ab968445
--- /dev/null
+++ b/patches/0097-skb-list/mac80211-status.patch
@@ -0,0 +1,47 @@
+Make ieee80211_tx_status handling work on older kernel versions
+
+The commit f02dff93e26b ("mac80211: extend ieee80211_tx_status_ext to
+support bulk free") makes use of the list attribute in the skb, but this
+is not available in kernel < 4.19, use the sk_buff_head instead on these
+kernel versions.
+
+--- a/include/net/mac80211.h
++++ b/include/net/mac80211.h
+@@ -1132,7 +1132,11 @@ struct ieee80211_tx_status {
+ 	struct ieee80211_tx_info *info;
+ 	struct sk_buff *skb;
+ 	struct rate_info *rate;
++#if LINUX_VERSION_IS_GEQ(4,19,0)
+ 	struct list_head *free_list;
++#else
++	struct sk_buff_head *free_list;
++#endif
+ };
+ 
+ /**
+--- a/net/mac80211/status.c
++++ b/net/mac80211/status.c
+@@ -1033,7 +1033,11 @@ static void __ieee80211_tx_status(struct
+ 	 */
+ 	if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
+ 		if (status->free_list)
++#if LINUX_VERSION_IS_GEQ(4,19,0)
+ 			list_add_tail(&skb->list, status->free_list);
++#else
++			__skb_queue_tail(status->free_list, skb);
++#endif
+ 		else
+ 			dev_kfree_skb(skb);
+ 		return;
+@@ -1183,7 +1187,11 @@ free:
+ 
+ 	ieee80211_report_used_skb(local, skb, false);
+ 	if (status->free_list)
++#if LINUX_VERSION_IS_GEQ(4,19,0)
+ 		list_add_tail(&skb->list, status->free_list);
++#else
++		__skb_queue_tail(status->free_list, skb);
++#endif
+ 	else
+ 		dev_kfree_skb(skb);
+ }
-- 
2.20.1

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