linux-kernel - Re: [PATCH v3] PCI: hv: Return zero, not garbage, when reading PCI_INTERRUPT

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Message-ID: <20240706032031.GF1195499@rocinante>
Date: Sat, 6 Jul 2024 12:20:31 +0900
From: Krzysztof Wilczyński <kw@...ux.com>
To: Wei Liu <wei.liu@...nel.org>
Cc: Linux on Hyper-V List <linux-hyperv@...r.kernel.org>, stable@...nel.org,
	Michael Kelley <mhklinux@...look.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Dexuan Cui <decui@...rosoft.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Jake Oshins <jakeo@...rosoft.com>,
	"open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" <linux-pci@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] PCI: hv: Return zero, not garbage, when reading
 PCI_INTERRUPT_PIN

Hello,

> The intent of the code snippet is to always return 0 for both
> PCI_INTERRUPT_LINE and PCI_INTERRUPT_PIN.
> 
> The check misses PCI_INTERRUPT_PIN. This patch fixes that.
> 
> This is discovered by this call in VFIO:
> 
>     pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
> 
> The old code does not set *val to 0 because it misses the check for
> PCI_INTERRUPT_PIN. Garbage is returned in that case.

Applied to controller/hyperv, thank you!

[1/1] PCI: hv: Return zero, not garbage, when reading PCI_INTERRUPT_PIN
      https://git.kernel.org/pci/pci/c/fea93a3e5d5e

	Krzysztof