linux-kernel - RE: [PATCH v2] hv_utils: drain the timesync packets on onchannelcallback

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Date:   Fri, 21 Aug 2020 15:45:38 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Vineeth Pillai <viremana@...ux.microsoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>
CC:     KY Srinivasan <kys@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] hv_utils: drain the timesync packets on
 onchannelcallback

From: viremana@...ux.microsoft.com Sent: Friday, August 21, 2020 8:29 AM
> 
> There could be instances where a system stall prevents the timesync
> packaets to be consumed. And this might lead to more than one packet
> pending in the ring buffer. Current code empties one packet per callback
> and it might be a stale one. So drain all the packets from ring buffer
> on each callback.
> 
> Signed-off-by: Vineeth Pillai <viremana@...ux.microsoft.com>
> ---
> 
>  v2:
>     - s/pr_warn/pr_warn_once/
> 
> ---
>  drivers/hv/hv_util.c | 19 ++++++++++++++++---
>  1 file changed, 16 insertions(+), 3 deletions(-)

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>