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Message-ID: <3c470a48-e971-9991-e096-3adfe1cc4468@broadcom.com>
Date:   Mon, 9 Jan 2023 09:52:32 +0100
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Subject: Re: [PATCH 2/3] brcmfmac: return error when getting invalid
 max_flowrings from dongle
To:     chainofflowers <chainofflowers@posteo.net>, ian.lin@infineon.com
Cc:     Double.Lo@infineon.com, brcm80211-dev-list@broadcom.com,
        brcm80211-dev-list@cypress.com, franky.lin@broadcom.com,
        hante.meuleman@broadcom.com, kvalo@kernel.org,
        linux-wireless@vger.kernel.org
References: <4781984.GXAFRqVoOG@luna>
From:   Arend van Spriel <arend.vanspriel@broadcom.com>
In-Reply-To: <4781984.GXAFRqVoOG@luna>
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On 1/8/2023 9:53 PM, chainofflowers wrote:
> Hi! This patch:
> https://lore.kernel.org/all/20220929031001.9962-3-ian.lin@infineon.com/
> 
> causes my Asus PCE-AC88 (1043:86fb) to stop working, because when modprobe
> loads brcmfmac it throws this error:
> ---
> [ 2740.647600] brcmfmac 0000:0d:00.0: brcmf_pcie_init_ringbuffers: invalid
> max_flowrings(264).
> ---
> 
> This is also being reported on reddit:
> https://www.reddit.com/r/archlinux/comments/104pqv9/
> no_wifi_since_kernel_update_yesterday/
> 
> (also, see https://forum.manjaro.org/t/brcmfmac-fails-to-load/131128)
> 
> I think that the check on value > 256 is used as a kind of red herring to
> indirectly spot an inconsistent properties report from the PCI bus (?) about
> the network card.

The firmware loaded into the wifi device requests the host for 264 
flowrings. This was apparently not expected to be a valid value, but 
your device shows it is.

> Before that patch, the driver was correctly working for me and I could not
> observe any kernel panic. Maybe, at least in my case, the wrong value was
> still reported but could be safely ignored, as at a later point in time, when
> the card is initialised, everything worked fine.
> 
> I am now stuck at kernel 6.1.1, if I upgrade I cannot use the card.
> Is there anything I can do to circumvent this issue? May I help somehow with
> debugging & testing? Please let me know...

6.2 is not formally released so I suppose you are an early adopter and 
aware of the risk that implies ;-) There is no real debugging needed. I 
will figure out what a sensible value would be and come up with a patch. 
If you can test that that would be great. Will let you know.

Regards,
Arend

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