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  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]
Date:	Sat, 05 Jul 2014 22:46:09 +0200
From:	Arnd Bergmann <>
Cc:	Rob Herring <>,
	Liviu Dudau <>,
	Sinan Kaya <>,
	linaro-kernel <>,
	Catalin Marinas <>,
	Device Tree ML <>,
	linux-pci <>,
	Jingoo Han <>,
	Will Deacon <>,
	LKML <>,
	Grant Likely <>,
	Kukjin Kim <>,
	Tanmay Inamdar <>,
	Suravee Suthikulanit <>,
	Benjamin Herrenschmidt <>,
	Bjorn Helgaas <>
Subject: Re: [PATCH v8 4/9] pci: OF: Fix the conversion of IO ranges into IO resources.

On Saturday 05 July 2014 14:25:52 Rob Herring wrote:
> On Tue, Jul 1, 2014 at 1:43 PM, Liviu Dudau <> wrote:
> > The ranges property for a host bridge controller in DT describes
> > the mapping between the PCI bus address and the CPU physical address.
> > The resources framework however expects that the IO resources start
> > at a pseudo "port" address 0 (zero) and have a maximum size of IO_SPACE_LIMIT.
> > The conversion from pci ranges to resources failed to take that into account.
> I don't think this change is right. There are 2 resources: the PCI bus
> addresses and cpu addresses. This function deals with the cpu
> addresses. Returning pci addresses for i/o and cpu addresses for
> memory is going to be error prone. We probably need both cpu and pci
> resources exposed to host controllers.
> Making the new function only deal with i/o bus resources and naming it
> of_pci_range_to_io_resource would be better.

I think you are correct that this change by itself is will break existing
drivers that rely on the current behavior of of_pci_range_to_resource,
but there is also something wrong with the existing implementation:

of_pci_range_to_resource() at the moment returns a the address in
cpu address space (i.e. IORESOURCE_MEM) but sets the res->flags
value to IORESOURCE_IO, which means it doesn't fit into the resource
tree. Liviu's version gets that part right, and it would be nice
to fix that eventually, however we do it here.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists