From: patchwork-bot+netdevbpf@kernel.org
To: Nicolai Buchwitz <nb@tipi-net.de>
Cc: oliver@neukum.org, andrew+netdev@lunn.ch, davem@davemloft.net,
edumazet@kernel.org, kuba@kernel.org, pabeni@redhat.com,
sjur.brandeland@stericsson.com, alexey.orishko@gmail.com,
bjorn@mork.no, gsuarez@smithmicro.com, leitao@debian.org,
linux-usb@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, mke@visotia.com
Subject: Re: [PATCH net v3 0/2] net: usb: cdc_ncm/cdc_mbim: fix netpoll lockup in tx_fixup
Date: Tue, 27 Oct 2026 01:40:05 +0000 [thread overview]
Message-ID: <179306520565.3504795.7927315467376347222.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20261024-cdc-ncm-netpoll-v3-0-6284ca03f967@tipi-net.de>
Hello:
This series was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:
On Sat, 24 Oct 2026 15:23:05 +0200 you wrote:
> Mikkel reported lockups with netconsole on a cdc_ncm device. Further
> analysis showed that netpoll calls ndo_start_xmit() with IRQs off but
> BHs on while holding the txq lock, and the spin_unlock_bh() in the
> tx_fixup paths runs pending softirqs. A transmit from one of them then
> spins on that txq lock.
>
> Patch 1 fixes cdc_ncm. Mikkel tested the v2 version of it. Patch 2
> fixes the same code in cdc_mbim and is untested.
>
> [...]
Here is the summary with links:
- [net,v3,1/2] net: usb: cdc_ncm: don't enable BHs in tx_fixup under netpoll
https://git.kernel.org/netdev/net/c/108ca34cf4b4
- [net,v3,2/2] net: usb: cdc_mbim: don't enable BHs in tx_fixup under netpoll
https://git.kernel.org/netdev/net/c/bfd7ced012c7
You are awesome, thank you!
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prev parent reply other threads:[~2026-10-27 1:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-24 13:23 [PATCH net v3 0/2] net: usb: cdc_ncm/cdc_mbim: fix netpoll lockup in tx_fixup Nicolai Buchwitz
2026-10-24 13:23 ` [PATCH net v3 1/2] net: usb: cdc_ncm: don't enable BHs in tx_fixup under netpoll Nicolai Buchwitz
2026-10-24 13:33 ` sashiko-bot
2026-10-24 13:23 ` [PATCH net v3 2/2] net: usb: cdc_mbim: " Nicolai Buchwitz
2026-10-24 13:33 ` sashiko-bot
2026-10-27 1:40 ` patchwork-bot+netdevbpf [this message]
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