[PATCH AUTOSEL 4.19 02/11] mac80211: set up the fwd_skb->dev for mesh forwarding

Sasha Levin
2021-12-21T02:03:24Z

From: Xing Song <xing.song@mediatek.com>

[ Upstream commit 942bd1070c3a39d1302fc5db73d60c86e3033c81 ]

Mesh forwarding requires that the fwd_skb->dev is set up for TX handling,
otherwise the following warning will be generated, so set it up for the
pending frames.

[ 72.835674 ] WARNING: CPU: 0 PID: 1193 at __skb_flow_dissect+0x284/0x1298
[ 72.842379 ] Modules linked in: ksmbd pppoe ppp_async l2tp_ppp ...
[ 72.962020 ] CPU: 0 PID: 1193 Comm: kworker/u5:1 Tainted: P S 5.4.137 #0
[ 72.969938 ] Hardware name: MT7622_MT7531 RFB (DT)
[ 72.974659 ] Workqueue: napi_workq napi_workfn
[ 72.979025 ] pstate: 60000005 (nZCv daif -PAN -UAO)
[ 72.983822 ] pc : __skb_flow_dissect+0x284/0x1298
[ 72.988444 ] lr : __skb_flow_dissect+0x54/0x1298
[ 72.992977 ] sp : ffffffc010c738c0
[ 72.996293 ] x29: ffffffc010c738c0 x28: 0000000000000000
[ 73.001615 ] x27: 000000000000ffc2 x26: ffffff800c2eb818
[ 73.006937 ] x25: ffffffc010a987c8 x24: 00000000000000ce
[ 73.012259 ] x23: ffffffc010c73a28 x22: ffffffc010a99c60
[ 73.017581 ] x21: 000000000000ffc2 x20: ffffff80094da800
[ 73.022903 ] x19: 0000000000000000 x18: 0000000000000014
[ 73.028226 ] x17: 00000000084d16af x16: 00000000d1fc0bab
[ 73.033548 ] x15: 00000000715f6034 x14: 000000009dbdd301
[ 73.038870 ] x13: 00000000ea4dcbc3 x12: 0000000000000040
[ 73.044192 ] x11: 000000000eb00ff0 x10: 0000000000000000
[ 73.049513 ] x9 : 000000000eb00073 x8 : 0000000000000088
[ 73.054834 ] x7 : 0000000000000000 x6 : 0000000000000001
[ 73.060155 ] x5 : 0000000000000000 x4 : 0000000000000000
[ 73.065476 ] x3 : ffffffc010a98000 x2 : 0000000000000000
[ 73.070797 ] x1 : 0000000000000000 x0 : 0000000000000000
[ 73.076120 ] Call trace:
[ 73.078572 ] __skb_flow_dissect+0x284/0x1298
[ 73.082846 ] __skb_get_hash+0x7c/0x228
[ 73.086629 ] ieee80211_txq_may_transmit+0x7fc/0x17b8 [mac80211]
[ 73.092564 ] ieee80211_tx_prepare_skb+0x20c/0x268 [mac80211]
[ 73.098238 ] ieee80211_tx_pending+0x144/0x330 [mac80211]
[ 73.103560 ] tasklet_action_common.isra.16+0xb4/0x158
[ 73.108618 ] tasklet_action+0x2c/0x38
[ 73.112286 ] __do_softirq+0x168/0x3b0
[ 73.115954 ] do_softirq.part.15+0x88/0x98
[ 73.119969 ] __local_bh_enable_ip+0xb0/0xb8
[ 73.124156 ] napi_workfn+0x58/0x90
[ 73.127565 ] process_one_work+0x20c/0x478
[ 73.131579 ] worker_thread+0x50/0x4f0
[ 73.135249 ] kthread+0x124/0x128
[ 73.138484 ] ret_from_fork+0x10/0x1c

Signed-off-by: Xing Song <xing.song@mediatek.com>
Tested-By: Frank Wunderlich <frank-w@public-files.de>
Link: https://lore.kernel.org/r/20211123033123.2684-1-xing.song@mediatek.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/mac80211/rx.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index e0baa563a4dea..7ef1fcb9529e8 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2801,6 +2801,7 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
if (!fwd_skb)
goto out;

+ fwd_skb->dev = sdata->dev;
fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
info = IEEE80211_SKB_CB(fwd_skb);
--
2.34.1