Patch "PCI: tegra: Fix pci_remap_iospace() failure path" has been added to the 4.8-stable tree

Patch "PCI: tegra: Fix pci_remap_iospace() failure path" has been added to the 4.8-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    PCI: tegra: Fix pci_remap_iospace() failure path

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pci-tegra-fix-pci_remap_iospace-failure-path.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 13f392ebc37e31568fae72a73ee378ae22a9740f Mon Sep 17 00:00:00 2001
From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Date: Mon, 15 Aug 2016 17:50:46 +0100
Subject: PCI: tegra: Fix pci_remap_iospace() failure path

From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

commit 13f392ebc37e31568fae72a73ee378ae22a9740f upstream.

On ARM/ARM64 architectures, PCI IO ports are emulated through memory mapped
IO, by reserving a chunk of virtual address space starting at PCI_IOBASE
and by mapping the PCI host bridges memory address space driving PCI IO
cycles to it.

PCI host bridge drivers that enable downstream PCI IO cycles map the host
bridge memory address responding to PCI IO cycles to the fixed virtual
address space through the pci_remap_iospace() API.

This means that if the pci_remap_iospace() function fails, the
corresponding host bridge PCI IO resource must be considered invalid, in
that there is no way for the kernel to actually drive PCI IO transactions
if the memory addresses responding to PCI IO cycles cannot be mapped into
the CPU virtual address space.

The PCI tegra host bridge driver adds the PCI IO resource retrieved from
firmware to the host bridge resource windows even if the
pci_remap_iospace() call fails; this is an actual bug in that the PCI host
bridge would consider the PCI IO resource valid (and possibly assign it to
downstream devices) even if the kernel was not able to map the PCI host
bridge memory address driving IO cycle to the CPU virtual address space (ie
pci_remap_iospace() failures).

Add the PCI host bridge driver pci_remap_iospace() failure path and do not
add the corresponding PCI host bridge PCI IO resources retrieved through
firmware when the pci_remap_iospace() function call fails, fixing the
issue.

Fixes: e6e9f471f5fe ("PCI: tegra: Use generic pci_remap_iospace() rather than ARM32-specific one")
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Thierry Reding <treding@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pci/host/pci-tegra.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -621,7 +621,11 @@ static int tegra_pcie_setup(int nr, stru
 	if (err < 0)
 		return err;
 
-	pci_add_resource_offset(&sys->resources, &pcie->pio, sys->io_offset);
+	err = pci_remap_iospace(&pcie->pio, pcie->io.start);
+	if (!err)
+		pci_add_resource_offset(&sys->resources, &pcie->pio,
+					sys->io_offset);
+
 	pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
 	pci_add_resource_offset(&sys->resources, &pcie->prefetch,
 				sys->mem_offset);
@@ -631,7 +635,6 @@ static int tegra_pcie_setup(int nr, stru
 	if (err < 0)
 		return err;
 
-	pci_remap_iospace(&pcie->pio, pcie->io.start);
 	return 1;
 }
 


Patches currently in stable-queue which might be from lorenzo.pieralisi@arm.com are

queue-4.8/pci-versatile-fix-pci_remap_iospace-failure-path.patch
queue-4.8/pci-aardvark-fix-pci_remap_iospace-failure-path.patch
queue-4.8/pci-designware-fix-pci_remap_iospace-failure-path.patch
queue-4.8/pci-tegra-fix-pci_remap_iospace-failure-path.patch
queue-4.8/pci-generic-fix-pci_remap_iospace-failure-path.patch
queue-4.8/pci-rcar-fix-pci_remap_iospace-failure-path.patch