linux-kernel - [PATCH net, 1/2] net: mana: Fix hint value before free irq

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Message-Id: <1674767085-18583-2-git-send-email-haiyangz@microsoft.com>
Date:   Thu, 26 Jan 2023 13:04:44 -0800
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     linux-hyperv@...r.kernel.org, netdev@...r.kernel.org
Cc:     haiyangz@...rosoft.com, decui@...rosoft.com, kys@...rosoft.com,
        paulros@...rosoft.com, olaf@...fle.de, vkuznets@...hat.com,
        davem@...emloft.net, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH net, 1/2] net: mana: Fix hint value before free irq

Need to clear affinity_hint before free_irq(), otherwise there is a
one-time warning and stack trace during module unloading.

To fix this bug, set affinity_hint to NULL before free as required.

Cc: stable@...r.kernel.org
Fixes: 71fa6887eeca ("net: mana: Assign interrupts to CPUs based on NUMA nodes")
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 drivers/net/ethernet/microsoft/mana/gdma_main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index b144f2237748..3bae9d4c1f08 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -1297,6 +1297,8 @@ static int mana_gd_setup_irqs(struct pci_dev *pdev)
 	for (j = i - 1; j >= 0; j--) {
 		irq = pci_irq_vector(pdev, j);
 		gic = &gc->irq_contexts[j];
+
+		irq_update_affinity_hint(irq, NULL);
 		free_irq(irq, gic);
 	}
 
@@ -1324,6 +1326,9 @@ static void mana_gd_remove_irqs(struct pci_dev *pdev)
 			continue;
 
 		gic = &gc->irq_contexts[i];
+
+		/* Need to clear the hint before free_irq */
+		irq_update_affinity_hint(irq, NULL);
 		free_irq(irq, gic);
 	}
 
-- 
2.25.1