netdev - Re: [net v3] net: wwan: t7xx: Fix napi rx poll issue

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Message-Id: 
 <174894122801.1429658.207799656496074697.git-patchwork-notify@kernel.org>
Date: Tue, 03 Jun 2025 09:00:28 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Jinjian Song <jinjian.song@...ocom.com>
Cc: chandrashekar.devegowda@...el.com, chiranjeevi.rapolu@...ux.intel.com,
 haijun.liu@...iatek.com, m.chetan.kumar@...ux.intel.com,
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 ryazanov.s.a@...il.com, johannes@...solutions.net, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
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 danielwinkler@...gle.com, andrew+netdev@...n.ch, horms@...nel.org,
 sreehari.kancharla@...ux.intel.com, ilpo.jarvinen@...ux.intel.com
Subject: Re: [net v3] net: wwan: t7xx: Fix napi rx poll issue

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@...hat.com>:

On Fri, 30 May 2025 11:16:48 +0800 you wrote:
> When driver handles the napi rx polling requests, the netdev might
> have been released by the dellink logic triggered by the disconnect
> operation on user plane. However, in the logic of processing skb in
> polling, an invalid netdev is still being used, which causes a panic.
> 
> BUG: kernel NULL pointer dereference, address: 00000000000000f1
> Oops: 0000 [#1] PREEMPT SMP NOPTI
> RIP: 0010:dev_gro_receive+0x3a/0x620
> [...]
> Call Trace:
>  <IRQ>
>  ? __die_body+0x68/0xb0
>  ? page_fault_oops+0x379/0x3e0
>  ? exc_page_fault+0x4f/0xa0
>  ? asm_exc_page_fault+0x22/0x30
>  ? __pfx_t7xx_ccmni_recv_skb+0x10/0x10 [mtk_t7xx (HASH:1400 7)]
>  ? dev_gro_receive+0x3a/0x620
>  napi_gro_receive+0xad/0x170
>  t7xx_ccmni_recv_skb+0x48/0x70 [mtk_t7xx (HASH:1400 7)]
>  t7xx_dpmaif_napi_rx_poll+0x590/0x800 [mtk_t7xx (HASH:1400 7)]
>  net_rx_action+0x103/0x470
>  irq_exit_rcu+0x13a/0x310
>  sysvec_apic_timer_interrupt+0x56/0x90
>  </IRQ>
> 
> [...]

Here is the summary with links:
  - [net,v3] net: wwan: t7xx: Fix napi rx poll issue
    https://git.kernel.org/netdev/net/c/905fe0845bb2

You are awesome, thank you!
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