linux-kernel - Re: [PATCH] x86/PCI: add spinlock held check to 'pcibios_fwaddrmap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120302120410.27cea21c@jbarnes-desktop>
Date:	Fri, 2 Mar 2012 12:04:10 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Myron Stowe <myron.stowe@...hat.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/PCI: add spinlock held check to
 'pcibios_fwaddrmap_lookup()'

On Fri, 02 Mar 2012 12:45:01 -0700
Myron Stowe <myron.stowe@...hat.com> wrote:

> 'pcibios_fwaddrmap_lookup()' is used to maintain FW-assigned BIOS BAR
> values for reinstatement when normal resource assignment attempts
> fail and must be called with the 'pcibios_fwaddrmap_lock' spinlock
> held.
> 
> This patch adds a WARN_ON notification if the spinlock is not currently
> held by the caller.
> 
> Signed-off-by: Myron Stowe <myron.stowe@...hat.com>
> ---
> 
>  arch/x86/pci/i386.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
> index 33e6a0b..831971e 100644
> --- a/arch/x86/pci/i386.c
> +++ b/arch/x86/pci/i386.c
> @@ -57,6 +57,8 @@ static struct pcibios_fwaddrmap *pcibios_fwaddrmap_lookup(struct pci_dev *dev)
>  {
>  	struct pcibios_fwaddrmap *map;
>  
> +	WARN_ON(!spin_is_locked(&pcibios_fwaddrmap_lock));
> +
>  	list_for_each_entry(map, &pcibios_fwaddrmappings, list)
>  		if (map->dev == dev)
>  			return map;
> 
> 

Applied, thanks.

-- 
Jesse Barnes, Intel Open Source Technology Center

Download attachment "signature.asc" of type "application/pgp-signature" (837 bytes)