Re: [PATCH] firewire: core: mask previous entry's type bits when looking for leaf

From: Adam Goldman
Date: Fri Jan 26 2024 - 04:24:41 EST


On Fri, Jan 26, 2024 at 10:17:05AM +0900, Takashi Sakamoto wrote:
> Would I request you to update the API documentation of fw_csr_string()
> as well and send the renewed patch as take 2?
>
>
> I have a mixed feeling about the change, but I'll finally accept it since
> we face the exception against documentation.
>
> As you know, in Annex A of document for configuration ROM of AV/C
> device[1], we can see the legacy layout of configuration ROM (page 22).
> In the layout, the descriptor leaf entry for vendor name locates after
> the immediate value entry for vendor ID, then the directory entry for
> vendor directory locates. However, in the case of Sony DVMC-DA1, the
> descriptor leaf entry locates after the directory entry. It is an
> exception.

Hi Takashi,

Thank you for your review and feedback.

After checking the 1394TA Configuration ROM document again, I agree that
the leaf entry for vendor name should be after an immediate value entry
according to this standard. The DVMC-DA1 does not conform. We should
consider its configuration ROM format to be another variation of the
legacy format. This variation is not mentioned in Annex A.

I will update the API documentation of fw_csr_string() and send a
revised patch.

-- Adam