linux-kernel - Re: [bisected][mainline]Kernel OOPs at msi_desc_to_pci

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Message-ID: <87wm55h8ep.fsf@yellow.woof>
Date: Wed, 08 Oct 2025 14:42:22 +0200
From: Nam Cao <namcao@...utronix.de>
To: Venkat Rao Bagalkote <venkat88@...ux.ibm.com>, Madhavan Srinivasan
 <maddy@...ux.ibm.com>, LKML <linux-kernel@...r.kernel.org>, linuxppc-dev
 <linuxppc-dev@...ts.ozlabs.org>, Gautam Menghani <gautam@...ux.ibm.com>
Subject: Re: [bisected][mainline]Kernel OOPs at msi_desc_to_pci_dev

Venkat Rao Bagalkote <venkat88@...ux.ibm.com> writes:
> IBM CI has reported a kernel crash while running module load and unload 
> testing on lpfc driver.

Thanks for the report.

I trust the below patch should fix the issue?

diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c
index 825f9432e03d..a82aaa786e9e 100644
--- a/arch/powerpc/platforms/pseries/msi.c
+++ b/arch/powerpc/platforms/pseries/msi.c
@@ -443,8 +443,7 @@ static int pseries_msi_ops_prepare(struct irq_domain *domain, struct device *dev
  */
 static void pseries_msi_ops_teardown(struct irq_domain *domain, msi_alloc_info_t *arg)
 {
-	struct msi_desc *desc = arg->desc;
-	struct pci_dev *pdev = msi_desc_to_pci_dev(desc);
+	struct pci_dev *pdev = to_pci_dev(domain->dev);
 
 	rtas_disable_msi(pdev);
 }