ACK: [xenial][PATCH] vmbus: fix missing signaling in hv_signal_on_read()

[Kamal Mostafa]

ACK (with the cherry line correction).  Patch surely would have been
suitable for stable 4.4, if that still existed.

Acked-by: Kamal Mostafa <kamal at canonical.com>

 -Kamal

On Mon, May 13, 2019 at 12:20:25PM -0300, Marcelo Henrique Cerri wrote:
> On Mon, May 13, 2019 at 11:42:35AM -0300, Marcelo Henrique Cerri wrote:
> > From: Dexuan Cui <decui at microsoft.com>
> > 
> > BugLink: http://bugs.launchpad.net/bugs/1826416
> > 
> > [Fixes upstream in a much larger set of patches that are not worth backporting
> > to 4.9 - gregkh]
> > 
> > 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 at microsoft.com>
> > Signed-off-by: Dexuan Cui <decui at microsoft.com>
> > Signed-off-by: Stephen Hemminger <sthemmin at microsoft.com>
> > Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
> > (cherry picked from commit 13c5e97701091f9b02ded0c68809f8a6b08c747a)
> 
> s/cherry picked from/cherry picked from stable 4.9.x/
> 
> We have several upstream patches for hyper-v applied on our 4.4.
> 
> > Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri at canonical.com>
> > ---
> >  include/linux/hyperv.h | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
> > index c92a083bcf16..f55a4c0c1475 100644
> > --- a/include/linux/hyperv.h
> > +++ b/include/linux/hyperv.h
> > @@ -1520,11 +1520,11 @@ static inline  void hv_signal_on_read(struct vmbus_channel *channel)
> >  
> >  	cur_write_sz = hv_get_bytes_to_write(rbi);
> >  
> > -	if (cur_write_sz < pending_sz)
> > +	if (cur_write_sz <= pending_sz)
> >  		return;
> >  
> >  	cached_write_sz = hv_get_cached_bytes_to_write(rbi);
> > -	if (cached_write_sz < pending_sz)
> > +	if (cached_write_sz <= pending_sz)
> >  		vmbus_setevent(channel);
> >  
> >  	return;
> > -- 
> > 2.20.1
> > 
> 
> -- 
> Regards,
> Marcelo
> 



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