linux-kernel - Re: [PATCH v2 1/4] Revert "igb: Disable threaded IRQ for igb_msix

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Message-ID: <20241108072003.jJDpdq9u@linutronix.de>
Date: Fri, 8 Nov 2024 08:20:03 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Wander Lairson Costa <wander@...hat.com>
Cc: Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Clark Williams <clrkwllms@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Simon Horman <horms@...nel.org>,
	Jacob Keller <jacob.e.keller@...el.com>,
	"moderated list:INTEL ETHERNET DRIVERS" <intel-wired-lan@...ts.osuosl.org>,
	"open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:Real-time Linux (PREEMPT_RT):Keyword:PREEMPT_RT" <linux-rt-devel@...ts.linux.dev>,
	tglx@...utronix.de
Subject: Re: [PATCH v2 1/4] Revert "igb: Disable threaded IRQ for
 igb_msix_other"

On 2024-11-06 08:14:26 [-0300], Wander Lairson Costa wrote:
> This reverts commit 338c4d3902feb5be49bfda530a72c7ab860e2c9f.
> 
> Sebastian noticed the ISR indirectly acquires spin_locks, which are
> sleeping locks under PREEMPT_RT, which leads to kernel splats.
> 
> Fixes: 338c4d3902feb ("igb: Disable threaded IRQ for igb_msix_other")
> Reported-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Signed-off-by: Wander Lairson Costa <wander@...hat.com>

Reviewed-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

This is the only patch.

Sebastian