[4/7] pci: mvebu: fix off-by-one in the computed size of the mbus windows

From: Willy Tarreau <w@1wt.eu>

mvebu_pcie_handle_membase_change() and
mvebu_pcie_handle_iobase_change() do not correctly compute the window
size. PCI uses an inclusive start/end address pair, which requires a
+1 when converting to size.

This only worked because a bug in the mbus driver allowed it to
silently accept and round up bogus sizes.

Fix this by adding one to the computed size.

Fixes: 45361a4fe4464180815157654aabbd2afb4848ad ('PCIe driver for Marvell Armada 370/XP systems')
Cc: <stable@vger.kernel.org> # v3.11+
Signed-off-by: Willy Tarreau <w@1wt.eu>
Reviewed-By: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Tested-by: Neil Greatorex <neil@fatboyfat.co.uk>
---
 drivers/pci/host/pci-mvebu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

On Fri, Apr 18, 2014 at 02:19:50PM +0200, Thomas Petazzoni wrote:
> From: Willy Tarreau <w@1wt.eu>
> 
> mvebu_pcie_handle_membase_change() and
> mvebu_pcie_handle_iobase_change() do not correctly compute the window
> size. PCI uses an inclusive start/end address pair, which requires a
> +1 when converting to size.
> 
> This only worked because a bug in the mbus driver allowed it to
> silently accept and round up bogus sizes.
> 
> Fix this by adding one to the computed size.
> 
> Fixes: 45361a4fe4464180815157654aabbd2afb4848ad ('PCIe driver for Marvell Armada 370/XP systems')
> Cc: <stable@vger.kernel.org> # v3.11+
> Signed-off-by: Willy Tarreau <w@1wt.eu>
> Reviewed-By: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> Tested-by: Neil Greatorex <neil@fatboyfat.co.uk>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

If I were merging via my tree, I would tweak the subject capitalization
so "git log --oneline drivers/pci/host/pci-mvebu.c" looks consistent.

> ---
>  drivers/pci/host/pci-mvebu.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
> index d3d1cfd..4829921 100644
> --- a/drivers/pci/host/pci-mvebu.c
> +++ b/drivers/pci/host/pci-mvebu.c
> @@ -331,7 +331,7 @@ static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
>  	port->iowin_base = port->pcie->io.start + iobase;
>  	port->iowin_size = ((0xFFF | ((port->bridge.iolimit & 0xF0) << 8) |
>  			    (port->bridge.iolimitupper << 16)) -
> -			    iobase);
> +			    iobase) + 1;
>  
>  	mvebu_mbus_add_window_remap_by_id(port->io_target, port->io_attr,
>  					  port->iowin_base, port->iowin_size,
> @@ -364,7 +364,7 @@ static void mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port)
>  	port->memwin_base  = ((port->bridge.membase & 0xFFF0) << 16);
>  	port->memwin_size  =
>  		(((port->bridge.memlimit & 0xFFF0) << 16) | 0xFFFFF) -
> -		port->memwin_base;
> +		port->memwin_base + 1;
>  
>  	mvebu_mbus_add_window_by_id(port->mem_target, port->mem_attr,
>  				    port->memwin_base, port->memwin_size);
> -- 
> 1.9.2
> 
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On Mon, Apr 21, 2014 at 10:47:54AM -0600, Bjorn Helgaas wrote:
> On Fri, Apr 18, 2014 at 02:19:50PM +0200, Thomas Petazzoni wrote:
> > From: Willy Tarreau <w@1wt.eu>
> > 
> > mvebu_pcie_handle_membase_change() and
> > mvebu_pcie_handle_iobase_change() do not correctly compute the window
> > size. PCI uses an inclusive start/end address pair, which requires a
> > +1 when converting to size.
> > 
> > This only worked because a bug in the mbus driver allowed it to
> > silently accept and round up bogus sizes.
> > 
> > Fix this by adding one to the computed size.
> > 
> > Fixes: 45361a4fe4464180815157654aabbd2afb4848ad ('PCIe driver for Marvell Armada 370/XP systems')
> > Cc: <stable@vger.kernel.org> # v3.11+
> > Signed-off-by: Willy Tarreau <w@1wt.eu>
> > Reviewed-By: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
> > Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> > Tested-by: Neil Greatorex <neil@fatboyfat.co.uk>
> 
> Acked-by: Bjorn Helgaas <bhelgaas@google.com>
> 
> If I were merging via my tree, I would tweak the subject capitalization
> so "git log --oneline drivers/pci/host/pci-mvebu.c" looks consistent.

Will do, thanks for the reminder.

thx,

Jason.
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