linux-kernel - Re: [PATCH 4.5 026/238] PCI: Disable IO/MEM decoding for devices with non-compliant BARs

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Message-ID: <1460418313.25201.69.camel@decadent.org.uk>
Date:	Tue, 12 Apr 2016 00:45:13 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Cc:	stable@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 4.5 026/238] PCI: Disable IO/MEM decoding for devices
 with non-compliant BARs

On Sun, 2016-04-10 at 11:33 -0700, Greg Kroah-Hartman wrote:
> 4.5-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> commit b84106b4e2290c081cdab521fa832596cdfea246 upstream.
> 
> The PCI config header (first 64 bytes of each device's config space) is
> defined by the PCI spec so generic software can identify the device and
> manage its usage of I/O, memory, and IRQ resources.
> 
> Some non-spec-compliant devices put registers other than BARs where the
> BARs should be.  When the PCI core sizes these "BARs", the reads and writes
> it does may have unwanted side effects, and the "BAR" may appear to
> describe non-sensical address space.
> 
> Add a flag bit to mark non-compliant devices so we don't touch their BARs.
> Turn off IO/MEM decoding to prevent the devices from consuming address
> space, since we can't read the BARs to find out what that address space
> would be.
[...]

No objection, but patch 005/238 seems to depend on this so please
reorder them so bisection will work.

Ben.

-- 
Ben Hutchings
This sentence contradicts itself - no actually it doesn't.
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