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Date: Wed, 6 Sep 2017 21:32:54 -0700
From: Stephen Hemminger <stephen@networkplumber.org>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: Dexuan Cui <decui@microsoft.com>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>,
        KY Srinivasan <kys@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>
Subject: Re: [PATCH] vmbus: fix missing signaling in hv_signal_on_read()
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On Thu, 7 Sep 2017 06:27:25 +0200
Greg KH <gregkh@linuxfoundation.org> wrote:

> On Thu, Sep 07, 2017 at 12:54:09AM +0000, Dexuan Cui wrote:
> > > From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> > > Sent: Wednesday, August 16, 2017 9:16 AM
> > > To: Greg KH <gregkh@linuxfoundation.org>
> > > Cc: KY Srinivasan <kys@microsoft.com>; Dexuan Cui <decui@microsoft.com>;
> > > devel@linuxdriverproject.org; linux-kernel@vger.kernel.org;
> > > stable@vger.kernel.org; Stephen Hemminger <sthemmin@microsoft.com>;
> > > John Starks <jon.Starks@microsoft.com>
> > > Subject: Re: [PATCH] vmbus: fix missing signaling in hv_signal_on_read()
> > > 
> > > On Wed, 16 Aug 2017 09:10:40 -0700
> > > Greg KH <gregkh@linuxfoundation.org> wrote:
> > >   
> > > > On Wed, Aug 16, 2017 at 08:49:46AM -0700, Stephen Hemminger wrote:  
> > > > > When the space available before start of reading (cached_write_sz)
> > > > > is the same as the host required space (pending_sz), we need to
> > > > > still signal host.
> > > > >
> > > > > Fixes: 433e19cf33d3 ("Drivers: hv: vmbus: finally fix  
> > > hv_need_to_signal_on_read()")  
> > > > >
> > > > > Signed-off-by: John Starks <jon.Starks@microsoft.com>
> > > > > Signed-off-by: Dexuan Cui <decui@microsoft.com>
> > > > > Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
> > > > > ---
> > > > > This patch is for 4.13 (and stable).
> > > > > A different fix is needed for linux-next.  
> > > >
> > > > Is there a fix for this in Linus's tree?  If so, what's the git commit
> > > > id?  We need to wait for that until I can take it in -stable.  
> > > 
> > > There is no commit yet in Linus's tree. Was submitting for both Linus
> > > and stable. Wasn't sure about the timing since 4.13 might close before he gets
> > > to it.  
> > 
> > Hi Greg and stable@vger.kernel.org,
> > We need the patch for the stable kernels:  v4.13, v4.12.10 and v4.9.47.
> > 
> > The patch is not in Linus's tree, because the bug is resolved there by a series
> >  of 4 patches (see the below).
> > 
> > IMO it's better to apply this small patch to the stable kernels rather than 
> > backporting the 4 big commits?  
> 
> It is always better to backport the original commits.  Will they work
> as-is, or do they need porting?

I will try for 4.13 but going back to 4.9 might be hard.