linux-kernel - RE: [patch 33/39] PCI/MSI: Sanitize MSI-X checks

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Message-ID: <BN9PR11MB5276843EE1BC8046C42A6D708C099@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Fri, 18 Nov 2022 07:38:47 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
CC:     "x86@...nel.org" <x86@...nel.org>, Joerg Roedel <joro@...tes.org>,
        "Will Deacon" <will@...nel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Lorenzo Pieralisi" <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        "Raj, Ashok" <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>,
        "Michael Ellerman" <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "Ahmed S. Darwish" <darwi@...utronix.de>,
        "Chatre, Reinette" <reinette.chatre@...el.com>
Subject: RE: [patch 33/39] PCI/MSI: Sanitize MSI-X checks

> From: Thomas Gleixner <tglx@...utronix.de>
> Sent: Friday, November 11, 2022 9:55 PM
> 
> @@ -785,7 +786,7 @@ int __pci_enable_msix_range(struct pci_d
>  				return -ENOSPC;
>  		}
> 
> -		rc = __pci_enable_msix(dev, entries, nvec, affd, flags);
> +		rc = msix_capability_init(dev, entries, nvec, affd);
>  		if (rc == 0)
>  			return nvec;
> 

The check in following lines doesn't make sense now:

		if (rc < minvec)
			return -ENOSPC;