RE: [PATCH v7 4/6] wifi: rtw88: sdio: track free TX pages and OQT credits for RTL8723BS

[Luka Gejak <luka.gejak@linux.dev>]

On August 25, 2026 10:22:53 AM GMT+02:00, Ping-Ke Shih <pkshih@realtek.com> wrote:

> But I don't find rtw_sdio_write_to_port()?

My fault, it does not exist in v7. It is a function I added in v8 while
splitting the locked region out for guard(), and I asked you about it
without saying that. Sorry for the confusion. In v8 the transfer moved
into rtw_sdio_write_to_port(), called from both the generic path and the
8723BS one, and the warning had to go either inside it once or in both
callers. That was the whole of my question.

> Is this a normal case? Can current sdio.c handle this properly?
> If so, I'd change to debug level.

It should never happen. rtw_sdio_tx_skb_prepare() aligns the pointer
itself: it pushes the packet descriptor, and if the result is not aligned
to RTW_SDIO_DATA_PTR_ALIGN it pushes the difference as padding and tells
the firmware about the shifted offset. main.c reserves those 8 bytes in
hw->extra_tx_headroom for SDIO so the push always has room. So by the time
rtw_sdio_write_port() runs the pointer is aligned by construction, and the
check is really an assertion that the alignment step did its job.

It has never fired here, across all the testing on this chip.

So I would keep it at warn rather than debug. If it ever does fire it means
the alignment path above is broken, and the transfer would go out with a
misaligned pointer, which is worth being loud about. But it is your code
and your call.

Best regards,
Luka Gejak