linux-kernel - Re: [PATCH v2] firmware: fix sending -ERESTARTSYS due to signal on fallback

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Message-ID: <CALCETrVi2_9-+SnyF6TzUDJfrJs6E_3uAncjKP=44zzY1xGwZg@mail.gmail.com>
Date:   Tue, 6 Jun 2017 21:56:47 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     "Theodore Ts'o" <tytso@....edu>, Alan Cox <alan@...ux.intel.com>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Stephen Boyd <stephen.boyd@...aro.org>,
        "Li, Yi" <yi1.li@...ux.intel.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jonathan Corbet <corbet@....net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "Fuzzey, Martin" <mfuzzey@...keon.com>,
        Linux API <linux-api@...r.kernel.org>,
        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@...nsource.altera.com,
        Moritz Fischer <moritz.fischer@...us.com>,
        Petr Mladek <pmladek@...e.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        David Howells <dhowells@...hat.com>,
        Peter Jones <pjones@...hat.com>,
        Hans de G oede <hdegoede@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] firmware: fix sending -ERESTARTSYS due to signal on fallback

On Tue, Jun 6, 2017 at 5:22 PM, Luis R. Rodriguez <mcgrof@...nel.org> wrote:
> On Tue, Jun 06, 2017 at 06:11:51PM -0400, Theodore Ts'o wrote:
>> On Tue, Jun 06, 2017 at 06:47:34PM +0200, Luis R. Rodriguez wrote:
>> > On Tue, Jun 06, 2017 at 03:53:16PM +0100, Alan Cox wrote:
>
> We rely on swait, and swait right now only uses -ERESTARTSYS. Are
> you saying we could mask out -ERESTARTSYS and map it to -ERESTARTNOINTR
> or -ERESTARTNOHAND if we see fit for some future functionality / need ?

I think that has essentially nothing to do with swait.  User code does
some syscall.  That syscall triggers a firmware load.  The caller gets
a signal.  If you're going to let firmware load get interrupted, you
need to consider what the syscall is.