linux-kernel - Re: next-20250324: x86_64: BUG: kernel NULL pointer dereference __pci_enable_msi

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Message-ID: <Z-LDdPeTsnBi8gAU@macbook.local>
Date: Tue, 25 Mar 2025 15:53:40 +0100
From: Roger Pau Monné <roger.pau@...rix.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Naresh Kamboju <naresh.kamboju@...aro.org>,
	PCI <linux-pci@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	lkft-triage@...ts.linaro.org,
	Linux Regressions <regressions@...ts.linux.dev>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	shivamurthy.shastri@...utronix.de,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Anders Roxell <anders.roxell@...aro.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: next-20250324: x86_64: BUG: kernel NULL pointer dereference
 __pci_enable_msi_range

On Tue, Mar 25, 2025 at 04:56:33PM +0300, Dan Carpenter wrote:
> If I had to guess, I'd say that it was related to Fixes: d9f2164238d8
> ("PCI/MSI: Convert pci_msi_ignore_mask to per MSI domain flag").  I
> suspect d->host_data can be NULL.  I could be wrong, but let's add Roger
> to the CC list just in case.

Indeed, sorry.  There's a patch from Thomas to switch to using
pci_msi_domain_supports() for fetching the flag, as there's no
guarantee all call contexts will have an associated msi_domain_info:

https://lore.kernel.org/xen-devel/87v7rxzct0.ffs@tglx/

Regards, Roger.