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SubjectRe: [patch] genirq/msi: Populate sysfs entry only once
On Mon, Jan 10, 2022 at 07:12:45PM +0100, 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@alien8.de>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> ---
> 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++;
> }

Yap, works.

Tested-by: Borislav Petkov <bp@suse.de>

--
Regards/Gruss,
Boris.

https://people.kernel.org/tglx/notes-about-netiquette

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