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

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Date:   Wed, 7 Jun 2017 19:08:58 +0200
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     "Fuzzey, Martin" <mfuzzey@...keon.com>,
        linux-fsdevel@...r.kernel.org, Alan Cox <alan@...ux.intel.com>,
        Ted Ts'o <tytso@....edu>, Andy Lutomirski <luto@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     "Luis R. Rodriguez" <mcgrof@...nel.org>,
        "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
        Linux API <linux-api@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg KH <gregkh@...uxfoundation.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>,
        "Li, Yi" <yi1.li@...ux.intel.com>, 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 Goede <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 Thu, May 25, 2017 at 10:28:38AM +0200, Fuzzey, Martin wrote:
> 1) Android init calls write() on the sysfs file
> 2) The sysfs .store() callback registered by a driver is called
> 3) The driver calls request_firmware()
> 4) request_firmware() sends the firmware load request to userspace and
> calls wait_for_completion_interruptible()

Martin, just for completeness on documenting on the commit log of the next
swait proposed fix for this -- what signal did the process get from which you
note the child dies below ? Exactly what in Android sent this signal ?

> 5) A child dies and raises SIGCHLD
> 6) wait_for_completion_interruptible() returns -ERESTARTSYS due to the signal

  Luis