Re: A500 boot crash in 4.2.0-rc3-00246-g763e326

[Helge Deller <deller@gmx.de>]

On 20.08.2015 21:31, Yinghai Lu wrote:
> On Wed, Aug 19, 2015 at 10:42 PM, Bjorn Helgaas <bhelgaas@google.com> wrote:
>
>> commit 51a660a2732c
>> Author: Bjorn Helgaas <bhelgaas@google.com>
>> 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@math.ut.ee
>>      Reported-by: Meelis Roos <mroos@linux.ee>
>>      Reported-by: Helge Deller <deller@gmx.de>
>>      Based-on-idea-by: Yinghai Lu <yinghai@kernel.org>
>>      Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
>>
>> 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@kernel.org>


Tested-by: Helge Deller <deller@gmx.de>
   and please add:
CC: stable@vger.kernel.org  # v3.19+

Helge