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@xxxxxxxxxxxxxxx> know about it.
>From 45ea2a5fed6dacb9bb0558d8b21eacc1c45d5bb4 Mon Sep 17 00:00:00 2001
From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
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@xxxxxxxxxx>
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@xxxxxxxxxx
Reported-by: Meelis Roos <mroos@xxxxxxxx>
Reported-by: Helge Deller <deller@xxxxxx>
Tested-by: Helge Deller <deller@xxxxxx>
Based-on-idea-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Acked-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxx are
queue-4.1/pci-don-t-use-64-bit-bus-addresses-on-pa-risc.patch
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