[PATCH 4.1 57/78] PCI: Dont use 64-bit bus addresses on PA-RISC

From	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Newsgroups	linux.kernel
Subject	[PATCH 4.1 57/78] PCI: Dont use 64-bit bus addresses on PA-RISC
Date	2015-09-12 01:00 +0200
Message-ID	<q7Fsw-7hE-67@gated-at.bofh.it> (permalink)
References	<q7Fsu-7hE-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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

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

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


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[PATCH 4.1 57/78] PCI: Dont use 64-bit bus addresses on PA-RISC Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-09-12 01:00 +0200

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