linux-kernel - Re: [Xen-devel] [PATCH 4/4] xen/pcifront: Fix mysterious crashes when NUMA locality information was extracted.

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Message-ID: <56C1E042.6000200@citrix.com>
Date:	Mon, 15 Feb 2016 14:27:14 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Tommi Airikka <tommi@...ikka.net>,
	<linux-kernel@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
	<david.vrabel@...rix.com>, <boris.ostrovsky@...cle.com>
CC:	<stable@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 4/4] xen/pcifront: Fix mysterious crashes when
 NUMA locality information was extracted.

On 11/02/16 21:10, Konrad Rzeszutek Wilk wrote:
> --- a/drivers/pci/xen-pcifront.c
> +++ b/drivers/pci/xen-pcifront.c

> @@ -576,6 +578,7 @@ static void pcifront_free_roots(struct pcifront_device *pdev)
>  		free_root_bus_devs(bus_entry->bus);
>  
>  		kfree(bus_entry->bus->sysdata);
> +		bus_entry->bus->sysdata = NULL;

I dropped this change, as it was unrelated.

I note that we free sysdata before removing the bus which looks racy to me.

David