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Subject: Re: [PATCH v5] brcmfmac: firmware: Fix firmware loading
To:     Dmitry Osipenko <digetx@gmail.com>,
        Arend van Spriel <aspriel@gmail.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Chi-hsien Lin <chi-hsien.lin@infineon.com>,
        Wright Feng <wright.feng@infineon.com>,
        Chung-hsien Hsu <chung-hsien.hsu@infineon.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        Linus Walleij <linus.walleij@linaro.org>
Cc:     linux-wireless@vger.kernel.org,
        Stefan Hansson <newbyte@disroot.org>
References: <20210808180510.8753-1-digetx@gmail.com>
From:   Arend van Spriel <arend.vanspriel@broadcom.com>
Message-ID: <902984be-2c27-e6b0-247b-8d9a94c08cc4@broadcom.com>
Date:   Mon, 9 Aug 2021 10:23:51 +0200
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On 8/8/2021 8:05 PM, Dmitry Osipenko wrote:
> From: Linus Walleij <linus.walleij@linaro.org>
> 
> 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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