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Subject[PATCH AUTOSEL 5.2 162/249] mt76: mt7615: do not process rx packets if the device is not initialized
Date
From: Lorenzo Bianconi <lorenzo@kernel.org>

[ Upstream commit 2dcb79cde6129d948a237ef7b48a73a0c82f1e01 ]

Fix following crash that occurs when the driver is processing rx packets
while the device is not initialized yet

$ rmmod mt7615e
[ 67.210261] mt7615e 0000:01:00.0: Message -239 (seq 2) timeout
$ modprobe mt7615e
[ 72.406937] bus=0x1, slot = 0x0, irq=0x16
[ 72.436590] CPU 0 Unable to handle kernel paging request at virtual address 00000004, epc == 8eec4240, ra == 8eec41e0
[ 72.450291] mt7615e 0000:01:00.0: Firmware is not ready for download
[ 72.457724] Oops[#1]:
[ 72.470494] mt7615e: probe of 0000:01:00.0 failed with error -5
[ 72.474829] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.114 #0
[ 72.498702] task: 805769e0 task.stack: 80564000
[ 72.507709] $ 0 : 00000000 00000001 00000000 00000001
[ 72.518106] $ 4 : 8f704dbc 00000000 00000000 8f7046c0
[ 72.528500] $ 8 : 00000024 8045e98c 81210008 11000000
[ 72.538895] $12 : 8fc09f60 00000008 00000019 00000033
[ 72.549289] $16 : 8f704d80 e00000ff 8f0c7800 3c182406
[ 72.559684] $20 : 00000006 8ee615a0 4e000108 00000000
[ 72.570078] $24 : 0000004c 8000cf94
[ 72.580474] $28 : 80564000 8fc09e38 00000001 8eec41e0
[ 72.590869] Hi : 00000001
[ 72.596582] Lo : 00000000
[ 72.602319] epc : 8eec4240 mt7615_mac_fill_rx+0xac/0x494 [mt7615e]
[ 72.614953] ra : 8eec41e0 mt7615_mac_fill_rx+0x4c/0x494 [mt7615e]
[ 72.627580] Status: 11008403 KERNEL EXL IE
[ 72.635899] Cause : 40800008 (ExcCode 02)
[ 72.643860] BadVA : 00000004
[ 72.649573] PrId : 0001992f (MIPS 1004Kc)
[ 72.657704] Modules linked in: mt7615e pppoe ppp_async pppox ppp_generic nf_conntrack_ipv6 mt76x2e mt76x2_common mt76x02_lib mt7603e mt76 mac80211 iptable_nat ipt_REJECT ipt_MASQUERADE cfg80211 xt_time xt_tcpudp xt_state xt_nat xt_mu]
[ 72.792717] Process swapper/0 (pid: 0, threadinfo=80564000, task=805769e0, tls=00000000)
[ 72.808799] Stack : 8f0c7800 00000800 8f0c7800 8032b874 00000000 40000000 8f704d80 8ee615a0
[ 72.825428] 8dc88010 00000001 8ee615e0 8eec09b0 8dc88010 8032b914 8f3aee80 80567d20
[ 72.842055] 00000000 8ee615e0 40000000 8f0c7800 00000108 8eec9944 00000000 00000000
[ 72.858682] 80508f10 80510000 00000001 80567d20 8ee615a0 00000000 00000000 8ee61c00
[ 72.875308] 8ee61c40 00000040 80610000 80580000 00000000 8ee615dc 8ee61a68 00000001
[ 72.891936] ...
[ 72.896793] Call Trace:
[ 72.901649] [<8eec4240>] mt7615_mac_fill_rx+0xac/0x494 [mt7615e]
[ 72.913602] [<8eec09b0>] mt7615_queue_rx_skb+0xe4/0x12c [mt7615e]
[ 72.925734] [<8eec9944>] mt76_dma_cleanup+0x390/0x42c [mt76]
[ 72.936988] Code: ae020018 8ea20004 24030001 <94420004> a602002a 8ea20004 90420000 14430003 a2020034
[ 72.956390]
[ 72.959676] ---[ end trace f176967739edb19f ]---

Fixes: 04b8e65922f6 ("mt76: add mac80211 driver for MT7615 PCIe-based chipsets")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/mediatek/mt76/mt7615/mac.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
index b8f48d10f27a..a27bc6791aa7 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
@@ -96,6 +96,9 @@ int mt7615_mac_fill_rx(struct mt7615_dev *dev, struct sk_buff *skb)
bool unicast, remove_pad, insert_ccmp_hdr = false;
int i, idx;

+ if (!test_bit(MT76_STATE_RUNNING, &dev->mt76.state))
+ return -EINVAL;
+
memset(status, 0, sizeof(*status));

unicast = (rxd1 & MT_RXD1_NORMAL_ADDR_TYPE) == MT_RXD1_NORMAL_U2M;
--
2.20.1
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