linux-kernel - Re: [PATCH] firmware: wake all waiters

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Message-ID: <20170627185915.GK18666@tuxbook>
Date:   Tue, 27 Jun 2017 11:59:15 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Ming Lei <ming.lei@...hat.com>, yi1.li@...ux.intel.com,
        "AKASHI, Takahiro" <takahiro.akashi@...aro.org>, nbroeking@...com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        mfuzzey@...keon.com, ebiederm@...ssion.com,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Daniel Wagner <wagi@...om.org>,
        David Woodhouse <dwmw2@...radead.org>,
        jewalt@...innovations.com, rafal@...ecki.pl,
        Arend van Spriel <arend.vanspriel@...adcom.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>, atull@...nel.org,
        Moritz Fischer <moritz.fischer@...us.com>, pmladek@...e.com,
        Johannes Berg <johannes.berg@...el.com>,
        emmanuel.grumbach@...el.com,
        Luca Coelho <luciano.coelho@...el.com>, luto@...nel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        David Howells <dhowells@...hat.com>, pjones@...hat.com,
        Hans de Goede <hdegoede@...hat.com>, alan@...ux.intel.com,
        Theodore Ts'o <tytso@....edu>, paul.gortmaker@...driver.com,
        mtosatti@...hat.com, mawilcox@...rosoft.com,
        Stephen Boyd <stephen.boyd@...aro.org>,
        Vikram Mulukutla <markivx@...eaurora.org>,
        lkml <linux-kernel@...r.kernel.org>, oss-drivers@...ronome.com
Subject: Re: [PATCH] firmware: wake all waiters

On Tue 27 Jun 11:03 PDT 2017, Luis R. Rodriguez wrote:
[..]
> Let's consider a crazy case where the uevent gets triggered, and userspace goes
> and signals Elon Musk somehow to transmit the needed firmware from Mars through
> a serial satellite link to earth, and somehow someday the device is finally
> ready to upload firmware from userspace. Once Elon's firmware lands home, we
> know all needed firmware has arrived so anything missing we can acknowledge now
> as missing, so we upload what we can and kick firmward into final-mode to tell
> the kernel we know we're really ready and any pending things will have to be
> given up.
> 
> This would prove the custom fallback crap was also never needed.
> 

Are you saying that each kernel driver should be written so that it will
either do direct loading or use firmwared?


>From the previous discussion Linus made it very clear that he expect
this driver to be compiled as a kernel module and Elon to issue a
modprobe once he lands. But IMHO, Elon's decision of using modprobe vs
firmwared should be his to make and not mine as a kernel developer.

Regards,
Bjorn