summarylogtreecommitdiffstats
path: root/0004-mac80211-disable-BHs-preemption-in-ieee80211_tx_cont.patch
diff options
context:
space:
mode:
Diffstat (limited to '0004-mac80211-disable-BHs-preemption-in-ieee80211_tx_cont.patch')
-rw-r--r--0004-mac80211-disable-BHs-preemption-in-ieee80211_tx_cont.patch43
1 files changed, 43 insertions, 0 deletions
diff --git a/0004-mac80211-disable-BHs-preemption-in-ieee80211_tx_cont.patch b/0004-mac80211-disable-BHs-preemption-in-ieee80211_tx_cont.patch
new file mode 100644
index 00000000000..727844c574c
--- /dev/null
+++ b/0004-mac80211-disable-BHs-preemption-in-ieee80211_tx_cont.patch
@@ -0,0 +1,43 @@
+From 0edeffbcce2711999349fe02599d196fa922c5aa Mon Sep 17 00:00:00 2001
+From: Denis Kenzior <denkenz@gmail.com>
+Date: Tue, 19 Jun 2018 10:39:50 -0500
+Subject: [PATCH 4/5] mac80211: disable BHs/preemption in
+ ieee80211_tx_control_port()
+
+On pre-emption enabled kernels the following print was being seen due to
+missing local_bh_disable/local_bh_enable calls. mac80211 assumes that
+pre-emption is disabled in the data path.
+
+ BUG: using smp_processor_id() in preemptible [00000000] code: iwd/517
+ caller is __ieee80211_subif_start_xmit+0x144/0x210 [mac80211]
+ [...]
+ Call Trace:
+ dump_stack+0x5c/0x80
+ check_preemption_disabled.cold.0+0x46/0x51
+ __ieee80211_subif_start_xmit+0x144/0x210 [mac80211]
+
+Fixes: 911806491425 ("mac80211: Add support for tx_control_port")
+Signed-off-by: Denis Kenzior <denkenz@gmail.com>
+[commit message rewrite, fixes tag]
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+---
+ net/mac80211/tx.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
+index 05a265cd573d..7404a5114597 100644
+--- a/net/mac80211/tx.c
++++ b/net/mac80211/tx.c
+@@ -4800,7 +4800,9 @@ int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
+ skb_reset_network_header(skb);
+ skb_reset_mac_header(skb);
+
++ local_bh_disable();
+ __ieee80211_subif_start_xmit(skb, skb->dev, flags);
++ local_bh_enable();
+
+ return 0;
+ }
+--
+2.18.0
+