Message-ID: <f430c376-5992-d394-ce55-5994c793c7c7@broadcom.com>
Date:   Wed, 15 Mar 2023 11:11:28 +0100
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Subject: Re: wifi breakage due to commit "wifi: brcmfmac: add support for
 vendor-specific firmware api"
To:     Johannes Berg <johannes@sipsolutions.net>,
        Michael Stapelberg <michael+lkml@stapelberg.ch>
Cc:     Kalle Valo <kvalo@kernel.org>,
        Franky Lin <franky.lin@broadcom.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        linux-wireless@vger.kernel.org
References: <CANnVG6=a3etRagG+RaSEH-b4_nfzxpEKffQtuMWrttrbgjunZQ@mail.gmail.com>
 <186e23b5668.279b.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com>
 <CANnVG6kjWj02eEFv_OeLiRtjrJ6yn4EsELz_BtrzFHH15GNMLw@mail.gmail.com>
 <186e26dc0a8.279b.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com>
 <CANnVG6n-eqKUQnX_6wncmjG1kyVfhxqs2L82xYQpDmGq89eVAQ@mail.gmail.com>
 <186e4673718.279b.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com>
 <CANnVG6kaGj1SVCqf2y3=Xj_N2G9j+-VhLDN4_WY_ywDswNkO3g@mail.gmail.com>
 <89262772-7358-77e8-8913-c459819d544a@broadcom.com>
 <a459b9adc5eb7b67a432bd947d47d1df08718762.camel@sipsolutions.net>
From:   Arend van Spriel <arend.vanspriel@broadcom.com>
In-Reply-To: <a459b9adc5eb7b67a432bd947d47d1df08718762.camel@sipsolutions.net>
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On 3/15/2023 10:57 AM, Johannes Berg wrote:
> On Wed, 2023-03-15 at 10:12 +0100, Arend van Spriel wrote:
>>
>> I think it works pretty similar to firmware loading. These days firmware
>> loading does not rely on a user-space helper and I assumed the same is
>> true for module loading. Will look into it.
>>
> 
> As far as I know you still need the modprobe helper in
> 
> /proc/sys/kernel/modprobe

Hi Michael,

With hint from Johannes I found this Kconfig option:

config MODPROBE_PATH
         string "Path to modprobe binary"
         default "/sbin/modprobe"
         help
           When kernel code requests a module, it does so by calling
           the "modprobe" userspace utility. This option allows you to
           set the path where that binary is found. This can be changed
           at runtime via the sysctl file
           /proc/sys/kernel/modprobe. Setting this to the empty string
           removes the kernel's ability to request modules (but
           userspace can still load modules explicitly).

Now checking the .config that you sent it says:

CONFIG_MODPROBE_PATH="/sbin/modprobe"

So my suspicion is that modprobe is not at that given location?

Regards,
Arend

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