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mac80211: disable BHs/preemption in ieee80211_tx_control_port()

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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>
This commit is contained in:
Denis Kenzior 2018-06-19 10:39:50 -05:00 committed by Johannes Berg
parent 4205c88eaf
commit e7441c9274
1 changed files with 2 additions and 0 deletions
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2
net/mac80211/tx.c
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@ -4845,7 +4845,9 @@ 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;
}