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@exchange.microsoft.com wrote:

...

From: Michael Kelley mhkelley@outlook.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@vger.kernel.org # 4.14 and above Signed-off-by: Michael Kelley mhkelley@outlook.com Signed-off-by: K. Y. Srinivasan kys@microsoft.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