netdev - Re: [PATCH net-next V5] ptp: fix corrupted list in ptp

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Message-ID: <ZUZhWepwPWLtmbDF@hoboy.vegasvil.org>
Date: Sat, 4 Nov 2023 08:20:57 -0700
From: Richard Cochran <richardcochran@...il.com>
To: Edward Adam Davis <eadavis@...com>
Cc: davem@...emloft.net, habetsm.xilinx@...il.com, jeremy@...ine.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	reibax@...il.com,
	syzbot+df3f3ef31f60781fa911@...kaller.appspotmail.com
Subject: Re: [PATCH net-next V5] ptp: fix corrupted list in ptp_open

On Sat, Nov 04, 2023 at 03:07:24PM +0800, Edward Adam Davis wrote:

> diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h
> index 52f87e394aa6..7d82960fd946 100644
> --- a/drivers/ptp/ptp_private.h
> +++ b/drivers/ptp/ptp_private.h
> @@ -44,6 +44,7 @@ struct ptp_clock {
>  	struct pps_device *pps_source;
>  	long dialed_frequency; /* remembers the frequency adjustment */
>  	struct list_head tsevqs; /* timestamp fifo list */
> +	struct mutex tsevq_mux; /* one process at a time writing the timestamp fifo list */

As I said before, it cannot be a mutex.  It must be a spin lock.

Thanks,
Richard