From: Simon Horman <horms@kernel.org>
To: Nicolai Buchwitz <nb@tipi-net.de>
Cc: "Oliver Neukum" <oliver@neukum.org>,
"Andrew Lunn" <andrew+netdev@lunn.ch>,
"David S. Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@kernel.org>,
"Jakub Kicinski" <kuba@kernel.org>,
"Paolo Abeni" <pabeni@redhat.com>,
"Sjur Brændeland" <sjur.brandeland@stericsson.com>,
"Alexey Orishko" <alexey.orishko@gmail.com>,
"Bjørn Mork" <bjorn@mork.no>,
"Greg Suarez" <gsuarez@smithmicro.com>,
"Breno Leitao" <leitao@debian.org>,
linux-usb@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH net v2 2/2] net: usb: cdc_mbim: don't enable BHs in tx_fixup under netpoll
Date: Thu, 22 Oct 2026 13:58:34 +0100 [thread overview]
Message-ID: <20261022125834.GF708417@horms.kernel.org> (raw)
In-Reply-To: <20261021-cdc-ncm-netpoll-v2-2-8818965bbb69@tipi-net.de>
On Wed, Oct 21, 2026 at 09:56:19AM +0200, Nicolai Buchwitz wrote:
> cdc_mbim_tx_fixup() has the same spin_unlock_bh() as cdc_ncm_tx_fixup().
> Under netpoll it runs pending softirqs while the txq lock is held, and
> a transmit from one of them spins on that lock.
>
> Use spin_lock_irqsave() as in cdc_ncm.
>
> Fixes: 9bf211a30b3f ("net: cdc_mbim: adding MBIM driver")
> Signed-off-by: Nicolai Buchwitz <nb@tipi-net.de>
Reviewed-by: Simon Horman <horms@kernel.org>
prev parent reply other threads:[~2026-10-22 12:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-21 7:56 [PATCH net v2 0/2] net: usb: cdc_ncm/cdc_mbim: fix netpoll lockup in tx_fixup Nicolai Buchwitz
2026-10-21 7:56 ` [PATCH net v2 1/2] net: usb: cdc_ncm: don't enable BHs in tx_fixup under netpoll Nicolai Buchwitz
2026-10-22 12:58 ` Simon Horman
2026-10-21 7:56 ` [PATCH net v2 2/2] net: usb: cdc_mbim: " Nicolai Buchwitz
2026-10-22 12:58 ` Simon Horman [this message]
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