Subject: Re: [PATCH net-next V2 3/4] net/mlx5e: Add HW timestamping (TS) support

From: Richard Cochran <[email-masked]>
Date: Mon, 21 Dec 2015 19:35:08 +0100

On Mon, Dec 21, 2015 at 04:35:23PM +0200, Saeed Mahameed wrote:
> think of a case where:
> CPU1: is just about to call
> "schedule_delayed_work(&tstamp->overflow_work,
> tstamp->overflow_period);"
> CPU2: cancel_delayed_work
> 
> In this case cancel_dalyed_work_sync (CPU2) will wait for CPU1 to
> complete but CPU1 will re-arm the work, and we will
> be left with tstamp->overflow_work running forever.

This is my understanding:  Once the work becomes re-queued, it will be
canceled before running again.

Thanks,
Richard