netdev - Re: [PATCH v2] net: fec: Use a spinlock to guard `fep->ptp_clk

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Date:   Fri, 2 Sep 2022 19:04:50 +0200
From:   Francesco Dolcini <francesco.dolcini@...adex.com>
To:     Csókás Bence <csokas.bence@...lan.hu>
CC:     netdev@...r.kernel.org, Richard Cochran <richardcochran@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Francesco Dolcini <francesco.dolcini@...adex.com>,
        Andrew Lunn <andrew@...n.ch>, kernel@...gutronix.de,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: Re: [PATCH v2] net: fec: Use a spinlock to guard `fep->ptp_clk_on`

On Thu, Sep 01, 2022 at 04:04:03PM +0200, Csókás Bence wrote:
> Mutexes cannot be taken in a non-preemptible context,
> causing a panic in `fec_ptp_save_state()`. Replacing
> `ptp_clk_mutex` by `tmreg_lock` fixes this.
> 
> Fixes: 6a4d7234ae9a ("net: fec: ptp: avoid register access when ipg clock is disabled")
> Fixes: f79959220fa5 ("fec: Restart PPS after link state change")
> Reported-by: Marc Kleine-Budde <mkl@...gutronix.de>
> Link: https://lore.kernel.org/all/20220827160922.642zlcd5foopozru@pengutronix.de/
> Signed-off-by: Csókás Bence <csokas.bence@...lan.hu>

Tested-by: Francesco Dolcini <francesco.dolcini@...adex.com> # Toradex Apalis iMX6