linux-kernel - Re: [patch 15/55] PCI: vmd: Create named irq domain

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Message-ID: <20170620200758.GC24415@localhost.localdomain>
Date:   Tue, 20 Jun 2017 16:07:59 -0400
From:   Keith Busch <keith.busch@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Christoph Hellwig <hch@....de>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Jens Axboe <axboe@...nel.dk>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org
Subject: Re: [patch 15/55] PCI: vmd: Create named irq domain

On Tue, Jun 20, 2017 at 01:37:15AM +0200, Thomas Gleixner wrote:
>  static int vmd_enable_domain(struct vmd_dev *vmd)
>  {
>  	struct pci_sysdata *sd = &vmd->sysdata;
> +	struct fwnode_handle *fn;
>  	struct resource *res;
>  	u32 upper_bits;
>  	unsigned long flags;
> @@ -617,8 +618,13 @@ static int vmd_enable_domain(struct vmd_
>  
>  	sd->node = pcibus_to_node(vmd->dev->bus);
>  
> -	vmd->irq_domain = pci_msi_create_irq_domain(NULL, &vmd_msi_domain_info,
> +	fn = irq_domain_alloc_named_id_fwnode("VMD-MSI", vmd->sysdata.domain);
> +	if (!fn)
> +		return -ENODEV;
> +
> +	vmd->irq_domain = pci_msi_create_irq_domain(fn, &vmd_msi_domain_info,
>  						    x86_vector_domain);
> +	kfree(fn);

If I'm following all this correctly, it looks like we need to use
irq_domain_free_fwnode with irq_domain_alloc_named_id_fwnode instead of
freeing 'fn' directly, otherwise we leak 'fwid->name'.