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

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Message-ID: <20241106111427.7272-1-wander@redhat.com>
Date: Wed,  6 Nov 2024 08:14:26 -0300
From: Wander Lairson Costa <wander@...hat.com>
To: 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>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Clark Williams <clrkwllms@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Simon Horman <horms@...nel.org>,
	Wander Lairson Costa <wander@...hat.com>,
	Jacob Keller <jacob.e.keller@...el.com>,
	intel-wired-lan@...ts.osuosl.org (moderated list:INTEL ETHERNET DRIVERS),
	netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
	linux-kernel@...r.kernel.org (open list),
	linux-rt-devel@...ts.linux.dev (open list:Real-time Linux (PREEMPT_RT):Keyword:PREEMPT_RT)
Cc: tglx@...utronix.de
Subject: [PATCH v2 1/4] Revert "igb: Disable threaded IRQ for igb_msix_other"

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>

---

Changelog:

v2: Add the Fixes tag
Signed-off-by: Wander Lairson Costa <wander@...hat.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index b83df5f94b1f5..f1d0881687233 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -907,7 +907,7 @@ static int igb_request_msix(struct igb_adapter *adapter)
 	int i, err = 0, vector = 0, free_vector = 0;
 
 	err = request_irq(adapter->msix_entries[vector].vector,
-			  igb_msix_other, IRQF_NO_THREAD, netdev->name, adapter);
+			  igb_msix_other, 0, netdev->name, adapter);
 	if (err)
 		goto err_out;
 
-- 
2.47.0