On Wed, Aug 19, 2015 at 10:42 PM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote:
> commit 51a660a2732c
> Author: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Date: Thu Aug 20 00:08:15 2015 -0500
>
> PCI: Don't use 64-bit bus addresses on PA-RISC
>
> 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>
> Based-on-idea-by: Yinghai Lu <yinghai@xxxxxxxxxx>
> Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
>
> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
> index 73de4ef..944f500 100644
> --- 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
Yes, that is better.
Acked-by: Yinghai Lu <yinghai@xxxxxxxxxx>
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