From: Ard Biesheuvel <ard.biesheu...@linaro.org>
Date: Fri, 14 Oct 2016 14:32:24 +0100
> On 14 October 2016 at 14:31, David Miller <da...@davemloft.net> wrote:
>> From: Ard Biesheuvel <ard.biesheu...@linaro.org>
>> Date: Fri, 14 Oct 2016 12:39:30 +0100
>>
>>> PCI devices that are 64-bit DMA capable should set the coherent
>>> DMA mask as well as the streaming DMA mask. On some architectures,
>>> these are managed separately, and so the coherent DMA mask will be
>>> left at its default value of 32 if it is not set explicitly. This
>>> results in errors such as
>>>
>>> r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
>>> hwdev DMA mask = 0x00000000ffffffff, dev_addr = 0x00000080fbfff000
>>> swiotlb: coherent allocation failed for device 0000:02:00.0 size=4096
>>> CPU: 0 PID: 1062 Comm: systemd-udevd Not tainted 4.8.0+ #35
>>> Hardware name: AMD Seattle/Seattle, BIOS 10:53:24 Oct 13 2016
>>>
>>> on systems without memory that is 32-bit addressable by PCI devices.
>>>
>>> Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
>> ...
>>> @@ -8281,6 +8282,8 @@ static int rtl_init_one(struct pci_dev *pdev, const
>>> struct pci_device_id *ent)
>>> dev->features |= NETIF_F_HIGHDMA;
>>> } else {
>>> rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
>>> + if (!rc)
>>> + rc = pci_set_consistent_dma_mask(pdev,
>>> DMA_BIT_MASK(32));
>>
>> As you state 32-bit is the default, therefore this part of your patch is
>> unnecessary.
>
> Perhaps, but the original code did not assume that either. Should I
> remove the other call in a subsequent patch as well?
I simply want you to respin this with the above hunk removed.
Your code changes and your commit message must be consistent.
