Re: [PATCH v5] brcmfmac: firmware: Fix firmware loading

On 8/8/2021 8:05 PM, Dmitry Osipenko wrote:

From: Linus Walleij <redacted>

The patch that would first try the board-specific firmware
had a bug because the fallback would not be called: the
asynchronous interface is used meaning request_firmware_nowait()
returns 0 immediately.

Harden the firmware loading like this:

- If we cannot build an alt_path (like if no board_type is
   specified) just request the first firmware without any
   suffix, like in the past.

- If the lookup of a board specific firmware fails, we get
   a NULL fw in the async callback, so just try again without
   the alt_path from a dedicated brcm_fw_request_done_alt_path
   callback.

- Drop the unnecessary prototype of brcm_fw_request_done.

- Added MODULE_FIRMWARE match for per-board SDIO bins, making
   userspace tools to pull all the relevant firmware files.

The original idea was to setup the path names in 
brcmf_fw_alloc_request() function, but with the introduction of the 
board_type for NVRAM files that was abandoned and we cook up alternative 
paths. Now similar is done for the firmware files. So I would want to 
rework the code, but for now I am going with Linus's/Your fix for the 
sake of having the regression more or less quickly resolved.

You reported an issue earlier where the firmware callback was called 
from the probe context causing it to hang and it is not clear to me 
whether that is fixed with this version of the patch.

Regards,
Arend

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