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Message-ID: <dac01b50-c559-c40a-871a-4da514e7c3a3@broadcom.com>
Date:   Mon, 13 Jun 2022 11:19:51 +0200
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Subject: Re: brcmfmac
To:     Hranislav Milenkovic <hmilenkovic@protonmail.com>
References: <ummn1_Vf6iygnVWDDcx07aAvrz2wPRnpMWB6A205JWSOMEYGVkGv0_uWYymiZTO7bManVdxSskozUDe_TcYAn6loKaOAptYNT2pl-Tu6q-g=@protonmail.com>
Cc:     linux-wireless <linux-wireless@vger.kernel.org>
From:   Arend van Spriel <arend.vanspriel@broadcom.com>
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On 6/12/2022 5:49 PM, Hranislav Milenkovic wrote:
> Hi Arend,
> I fouded your e-mail here 
> https://wireless.wiki.kernel.org/en/users/drivers/brcm80211 
> <https://wireless.wiki.kernel.org/en/users/drivers/brcm80211>
> I have netgear R8000 with brcm 43602 wifi chip. I am using ddwrt with 
> experimental build. There are 2 versions of build, normal with dhd and 
> experimental with brvmfmac driver 
> https://dd-wrt.com/support/other-downloads/?path=betas%2F2022%2F06-10-2022-r49139%2Fnetgear-r8000%2F 
> <https://dd-wrt.com/support/other-downloads/?path=betas%2F2022%2F06-10-2022-r49139%2Fnetgear-r8000%2F>
> Router crashes sometimes and I emailed ddwrt devs with crashlog... but 
> they told me
> 
> "there is nothing to fix. its a firmware error. broadcom does not 
> provide support for these firmwares . I cannot fix the firmware error 
> for that chipset. its a binary. we can only seek for a newer firmware 
> binary somewhere in the wild..."

Looked at the log and ddwrt devs are mistaken. In the log it shows:

  Jun 12 13:26:00 109.198.5.214 logger : calling done start_checkhostapd
  Jun 12 13:26:07 109.198.5.214 kernel [ 4743.815344] ieee80211 phy2: 
brcmf_fil_cmd_data: Firmware error:  (-23) cmd 262
  Jun 12 13:27:04 109.198.5.214 kernel [ 4800.660849] Unable to handle 
kernel NULL pointer dereference at virtual address 00000058

So there is a command failing in firmware with error -23, but this is 
harmless. The NULL pointer dereference is a driver crash. Can you build 
the kernel with CONFIG_DEBUG_INFO and provide me with the brcmfmac 
kernel module, ie. brcmfmac.ko?

Regards,
Arend

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