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

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Message-ID: <CAOCOHw4GtC-7OM0g4wLAeOqYsJgQd-mTnBjqLMP9n_x06a8LqQ@mail.gmail.com>
Date:   Tue, 27 Jun 2017 10:48:25 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     "Luis R. Rodriguez" <mcgrof@...nel.org>,
        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 Mon, Jun 26, 2017 at 7:10 PM, Jakub Kicinski
<jakub.kicinski@...ronome.com> wrote:
> On Mon, 26 Jun 2017 23:20:36 +0200, Luis R. Rodriguez wrote:
[..]
>  - how to stay bound and retry the direct default FW load until rootfs
>    is mounted (equivalent to when -EPROBE_DEFER would give up);

If you constrain this problem to only await the mounting of a root
file system you miss the various cases where rootfs is later pivoted
or the firmware isn't stored in the root file system (e.g. every
Android device out there).

Regards,
Bjorn