Re: [Qemu-devel] [PATCH v5 1/4] net/rocker: Remove the dead error handling

[Markus Armbruster <armbru@redhat.com>]

Philippe Mathieu-Daudé <f4bug@amsat.org> writes:

> Hi Markus,
>
> On 05/23/2017 06:27 AM, Markus Armbruster wrote:
> [...]
>> There's one more cleanup opportunity:
>>
> [...]
>>>      if (pci_dma_read(dev, le64_to_cpu(info->desc.buf_addr), info->buf, size)) {
>>>          return NULL;
>>>      }
>>
>> None of the pci_dma_read() calls outside rocker check the return value.
>> Just as well, because it always returns 0.  Please clean this up in a
>> separate followup patch.
>
> It may be the correct way to do it but this sounds like we are missing
> something somewhere... pci_dma_read() calls pci_dma_rw() which always
> returns 0. Why not let it returns void? It is inlined and never used
> by address. Else we should document why returning 0 is correct, and
> what is the reason to not use a void prototype.
>
> pci_dma_rw() calls dma_memory_rw() which does return a boolean value,
> false on success (MEMTX_OK) and true on error
> (MEMTX_ERROR/DECODE_ERROR)

PCI question.  Michael, Marcel?