linux-kernel - Re: [PATCH 1/1] Drivers: hv: vmbus: Fix ring buffer signaling

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Message-ID: <20180329072445.GA13733@kroah.com>
Date:   Thu, 29 Mar 2018 09:24:45 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     kys@...hange.microsoft.com, kys@...rosoft.com,
        linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        olaf@...fle.de, apw@...onical.com, vkuznets@...hat.com,
        jasowang@...hat.com, leann.ogasawara@...onical.com,
        marcelo.cerri@...onical.com, sthemmin@...rosoft.com,
        Michael Kelley <mhkelley@...look.com>,
        Stable <stable@...r.kernel.org>
Subject: Re: [PATCH 1/1] Drivers: hv: vmbus: Fix ring buffer signaling

On Wed, Mar 28, 2018 at 12:01:42PM -0700, Stephen Hemminger wrote:
> On Sun,  4 Mar 2018 22:24:08 -0700
> kys@...hange.microsoft.com wrote:
> 
> > From: Michael Kelley <mhkelley@...look.com>
> > 
> > Fix bugs in signaling the Hyper-V host when freeing space in the
> > host->guest ring buffer:
> > 
> > 1. The interrupt_mask must not be used to determine whether to signal
> >    on the host->guest ring buffer
> > 2. The ring buffer write_index must be read (via hv_get_bytes_to_write)
> >    *after* pending_send_sz is read in order to avoid a race condition
> > 3. Comparisons with pending_send_sz must treat the "equals" case as
> >    not-enough-space
> > 4. Don't signal if the pending_send_sz feature is not present. Older
> >    versions of Hyper-V that don't implement this feature will poll.
> > 
> > Fixes: 03bad714a161 ("vmbus: more host signalling avoidance")
> > 
> > Cc: Stable <stable@...r.kernel.org> # 4.14 and above
> > Signed-off-by: Michael Kelley <mhkelley@...look.com>
> > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> 
> What ever happened to this patch? It doesn't seem to be in char-misc, upstream,
> or stable kernel tree yet.
> 

It was in the 4.14.31 and 4.15.14 stable releases.

thanks,

greg k-h