[PATCH 3.11 049/138] PCI: mvebu: fix off-by-one in the computed size of the mbus windows

[Luis Henriques]

3.11.10.11 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Willy Tarreau <w@xxxxxx>

commit b6d07e0273d3296cfbdc88145b8a00ddbefb310a upstream.

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: 45361a4fe446 ('PCIe driver for Marvell Armada 370/XP systems')
Signed-off-by: Willy Tarreau <w@xxxxxx>
Reviewed-By: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/1397823593-1932-5-git-send-email-thomas.petazzoni@xxxxxxxxxxxxxxxxxx
Tested-by: Neil Greatorex <neil@xxxxxxxxxxxxxxx>
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Jason Cooper <jason@xxxxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
 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 86d3fa4ba88e..bf95d8c4e78a 100644
--- a/drivers/pci/host/pci-mvebu.c
+++ b/drivers/pci/host/pci-mvebu.c
@@ -293,7 +293,7 @@ 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_flags(port->name, port->iowin_base,
 					  port->iowin_size,
@@ -328,7 +328,7 @@ 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_remap_flags(port->name, port->memwin_base,
 					  port->memwin_size,
-- 
1.9.1

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