Patch "PCI: Don't use 64-bit bus addresses on PA-RISC" has been added to the 4.1-stable tree

Patch "PCI: Don't use 64-bit bus addresses on PA-RISC" has been added to the 4.1-stable tree

[gregkh]

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

    PCI: Don't use 64-bit bus addresses on PA-RISC

to the 4.1-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-don-t-use-64-bit-bus-addresses-on-pa-risc.patch
and it can be found in the queue-4.1 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 45ea2a5fed6dacb9bb0558d8b21eacc1c45d5bb4 Mon Sep 17 00:00:00 2001
From: Bjorn Helgaas <bhelgaas@google.com>
Date: Thu, 20 Aug 2015 00:08:15 -0500
Subject: PCI: Don't use 64-bit bus addresses on PA-RISC

From: Bjorn Helgaas <bhelgaas@google.com>

commit 45ea2a5fed6dacb9bb0558d8b21eacc1c45d5bb4 upstream.

Meelis and Helge reported that 3a9ad0b4fdcd ("PCI: Add pci_bus_addr_t")
caused HPMCs on A500 and hangs on rp5470.

PA-RISC does not set ARCH_DMA_ADDR_T_64BIT, even for 64-bit kernels, so
prior to 3a9ad0b4fdcd, we always used 32-bit PCI addresses.  After
3a9ad0b4fdcd, we do use 64-bit PCI addresses in 64-bit kernels, and
apparently there's some PA-RISC problem related to them.

Fixes: 3a9ad0b4fdcd ("PCI: Add pci_bus_addr_t")
Link: http://lkml.kernel.org/r/alpine.LRH.2.11.1507260929000.30065@math.ut.ee
Reported-by: Meelis Roos <mroos@linux.ee>
Reported-by: Helge Deller <deller@gmx.de>
Tested-by: Helge Deller <deller@gmx.de>
Based-on-idea-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pci/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -2,7 +2,7 @@
 # PCI configuration
 #
 config PCI_BUS_ADDR_T_64BIT
-	def_bool y if (ARCH_DMA_ADDR_T_64BIT || 64BIT)
+	def_bool y if (ARCH_DMA_ADDR_T_64BIT || (64BIT && !PARISC))
 	depends on PCI
 
 config PCI_MSI


Patches currently in stable-queue which might be from bhelgaas@google.com are

queue-4.1/pci-don-t-use-64-bit-bus-addresses-on-pa-risc.patch