linux-kernel - Re: [patch] genirq/msi: Populate sysfs entry only once

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Date:   Tue, 11 Jan 2022 10:02:01 +0100
From:   Cédric Le Goater <clg@...d.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
CC:     Bjorn Helgaas <helgaas@...nel.org>, Marc Zygnier <maz@...nel.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Megha Dey <megha.dey@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, <linux-pci@...r.kernel.org>,
        <xen-devel@...ts.xenproject.org>, Juergen Gross <jgross@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        <linux-s390@...r.kernel.org>, Heiko Carstens <hca@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>, <linux-ntb@...glegroups.com>
Subject: Re: [patch] genirq/msi: Populate sysfs entry only once

On 1/10/22 19:12, Thomas Gleixner wrote:
> The MSI entries for multi-MSI are populated en bloc for the MSI descriptor,
> but the current code invokes the population inside the per interrupt loop
> which triggers a warning in the sysfs code and causes the interrupt
> allocation to fail.
> 
> Move it outside of the loop so it works correctly for single and multi-MSI.
> 
> Fixes: bf5e758f02fc ("genirq/msi: Simplify sysfs handling")
> Reported-by: Borislav Petkov <bp@...en8.de>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Reviewed-by: Cédric Le Goater <clg@...d.org>

Thanks,

C.

> ---
>   kernel/irq/msi.c |   11 +++++------
>   1 file changed, 5 insertions(+), 6 deletions(-)
> 
> --- a/kernel/irq/msi.c
> +++ b/kernel/irq/msi.c
> @@ -887,12 +887,11 @@ int __msi_domain_alloc_irqs(struct irq_d
>   			ret = msi_init_virq(domain, virq + i, vflags);
>   			if (ret)
>   				return ret;
> -
> -			if (info->flags & MSI_FLAG_DEV_SYSFS) {
> -				ret = msi_sysfs_populate_desc(dev, desc);
> -				if (ret)
> -					return ret;
> -			}
> +		}
> +		if (info->flags & MSI_FLAG_DEV_SYSFS) {
> +			ret = msi_sysfs_populate_desc(dev, desc);
> +			if (ret)
> +				return ret;
>   		}
>   		allocated++;
>   	}
>