linux-kernel - Re: [PATCH v3 4/4] firmware: send -EINTR on signal abort on fallback mechanism

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Date:   Mon, 17 Jul 2017 18:04:33 +0200
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     "Luis R. Rodriguez" <mcgrof@...nel.org>, wagi@...om.org,
        yi1.li@...ux.intel.com, takahiro.akashi@...aro.org,
        luto@...nel.org, ebiederm@...ssion.com, dmitry.torokhov@...il.com,
        arend.vanspriel@...adcom.com, dwmw2@...radead.org,
        rjw@...ysocki.net, atull@...nel.org, moritz.fischer@...us.com,
        pmladek@...e.com, johannes.berg@...el.com,
        emmanuel.grumbach@...el.com, luciano.coelho@...el.com,
        kvalo@...eaurora.org, torvalds@...ux-foundation.org,
        keescook@...omium.org, dhowells@...hat.com, pjones@...hat.com,
        hdegoede@...hat.com, alan@...ux.intel.com, tytso@....edu,
        dave@...olabs.net, mawilcox@...rosoft.com, tglx@...utronix.de,
        peterz@...radead.org, mfuzzey@...keon.com,
        jakub.kicinski@...ronome.com, nbroeking@...com,
        jewalt@...innovations.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/4] firmware: send -EINTR on signal abort on fallback
 mechanism

On Mon, Jul 17, 2017 at 04:00:07PM +0200, Greg KH wrote:
> On Thu, Jun 29, 2017 at 01:51:51PM -0700, Luis R. Rodriguez wrote:
> > Right now we send -EAGAIN to a syfs write which got interrupted.
> > Userspace can't tell what happened though, send -EINTR if we
> > were killed due to a signal so userspace can tell things apart.
> > 
> > This is only applicable to the fallback mechanism.
> > 
> > Reported-by: Martin Fuzzey <mfuzzey@...keon.com>
> > Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>
> > ---
> >  drivers/base/firmware_class.c | 9 ++++++---
> >  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> This doesn't need to go into 4.13-final, right? 

Nope.

> Can it wait for 4.14-rc1?

Yes. The bigger issue was the unexpected signals causing interruption.
This I consider a secondary and not critical issue so I did not Cc stable.

  Luis