linux-kernel - Re: [PATCH 3/3] phy: nxp-c45-tja11xx: read the tx timestamp without lock

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Date:   Mon, 20 Dec 2021 16:10:43 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     "Radu Pirea (NXP OSS)" <radu-nicolae.pirea@....nxp.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        christian.herber@....com, hkallweit1@...il.com,
        linux@...linux.org.uk, davem@...emloft.net, kuba@...nel.org
Subject: Re: [PATCH 3/3] phy: nxp-c45-tja11xx: read the tx timestamp without
 lock

On Mon, Dec 20, 2021 at 02:08:59PM +0200, Radu Pirea (NXP OSS) wrote:
> The tx timestamps are read from only one place in interrupt or polling
> mode. Locking the mutex is useless.

You cannot take a mutex in an interrupt handler. So your description
is probably not accurate.

Is it safe for other ptp operations to be performed in parallel with
reading the TX timestamp? _nxp_c45_ptp_settime64()?

	Andrew