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

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Message-ID: <20180328120142.7ba72aa2@xeon-e3>
Date:   Wed, 28 Mar 2018 12:01:42 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     kys@...hange.microsoft.com
Cc:     kys@...rosoft.com, gregkh@...uxfoundation.org,
        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 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.